Here is the timeline for the events in the Arcadia Chronicles. It has a fairly accurate list of all the major events that took place in the series. Though because of the nature of the events, there are spoilers for them.
NOTE - The dates here were estimates taken from the Megaman X wiki back when it had the exact series timeline posted (viewable
here).
Though for ease of use, I prefer people just to use the 21XX style designations rather than give exact dates.
2175 - Megaman X8
2175 - Chaos Advent (3 weeks after X8) - Focuses on the Rookie Hunter team 66.
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- Team 66 meets for the first time in the training room. Unfortunately, the training program goes haywire and they end up fighting a holographic copy of Zero. Thus marks the beginning of the quest to discover who the saboteur is.
- Team 66 investigates strange disturbances underneath a warehouse. Turns out to be a tunnel that leads to a bank. They successfuly stop the robbery and kill Quake Earthworm.
- Team 66 discovers a maverick HQ in the city, so they investigate. They end up teleported to a castle in Scotland guarded by Technetium Terrier. They destroy the castle's defenses and allow the hunters to break through to capture the castle. Technetium Terrier is killed in the fight.
- Team 66 attempts to stop an assault on Giga City while it is under construction. The assault succeeds thanks in part to espionage and the Rookies ignoring mission objectives. Soar Squirrel is killed in the battle though.
- Team 66 lands in the arctic circle, after breaking through heavy resistance they infilitrate the maverick training facility and kill Arctic Aardvark.
- Team 66 heads to Afghanistan when Shock Scorpion (a maverick with the ability to infect others) is discovered. They persue the maverick on landchasers then managed to kill Shock Scorpion outside Kabul.
- Team 66 attempts to stop a maverick from capturing radioactive isotypes. The mission fails when a nuclear blast detonates and kills 8 million people/reploids.
- Helios Space weapon is launched by Signas to aid Hunters.
- Sigma is revealed to have been brought back to Earth for study. (His body is eventually sealed then buried in a scrapyard.)
2210 - Command Mission
- X, Zero and Shadow (a new hunter) go to Giga city to stop an insurrection.
2210 - Dr. Weil is born (NOTE - The MM wiki timeline states the Weil is born in 2230... This is where my story deviates.)
2228 - Attention Rookies: Zero. (This is where we're playing through now.)
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- Black cape attempts to steal a prototype armor from Cabal Inc, but is prevented.
- Cabal ships a new set of armor to the Hunters, but the armor is ambushed along the way. Hunters successfully protect the armor and end up killing Electron Echidna.
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2230 - Attention Rookies (55 years after CA)
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- During an assault on Hunter HQ, a new virus pops up... one that increases the maverick's power but turns maverick's blood blue. Samples are taken.
- A maverick (Bombardier Panthieron) is stomping around a city causing destruction, the hunters are split into 2 teams, one to take out the maverick and the other to investigate a strange energy signature in the jungle (Solarion Vineyard). Both mavericks are killed.
- A maverick encampment is located in the desert, the hunters are dispatched to locate it. They uncover a mobile facility that the mavericks are using lead by Terra Groundhog.
- The hunters head to the Canadian Tundra to investigate rumours of a bio-weapon. The rumours are false, but they do encounter Tundra Fox who uses an upgraded version of the virus the hunters recovered earlier... with devastating results to the hunters and himself.
- The hunters respond to a triple pronged maverick assault on the Hunter base. The attack turns out to be a rouse to split up the Hunter forces. Signas activates the Helios space laser to cut the enemy forces apart. The weapon's power is immense, destroying most of the enemy ships... And taking out most of the hunter base... X teleports in just in time and uses all his power to hold the Helios laser off to give everyone time to escape. X is killed in the process. Pyro Cerbrus appears to capitalize on the disaster. The hunters end up taking out Pyro Cerbrus' ship
- In the aftermath of Signas's death, Zero becomes the new Commander. Alia detects a floating battleship. Zero decides to sent a team to ambush it and exact a measure of justice against the mavericks. The hunters encounter Titanium Tortoise who takes the ship into space, they kill him which causes the ship to plummet to the ground. Zero orders the Enigma Cannon to be used. The hunters warp out just before the shot hits and destroys the ship.
- The mavericks use one of their former weapon manufacturing facilities as a trap for the hunters. But the Hunters battle Race Raccoon, but he is killed when a strange black aircraft appears overhead and fires a shot at him. The hunters escape before the base explodes.
- Spread Sphinx challenges Zero to a one on one duel. Zero accepts. The fight occurs in the remains of Hunter HQ's training room. The fight ends with Zero carving Spread Sphinx in half... but her final attack explodes, taking Zero out. All that remains of Zero was his saber.
- The strange black craft appears over top of Hunter HQ with a message for the hunters. A team of hunters board the craft and discover the identity of the villian... X!?! And Zero? The hunters do battle with their allies.
- After defeating X it is revealed that Sigma had managed to infect X with a new virus, it took years to work though. X later recruited Zero by using a modified version of the same virus. But having been defeated, the virus was sent into remission when X shut down. Similarly, Zero was developing an immunity to it, so when he was knocked out he became immune to it on his own.
- Mother elf is created (Weil assists with the creation), it then begins the purification process in X. X wakes up. Because he was the base for all reploids, he is the only one who can use the Mother Elf to start the purge of the maverick virus. After he begins the purge, he goes to sleep to finish his own purge.
2260 - Attention Rookies 2 (30 years after AR, Weil is now 50 yrs old.)
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- Kicks off with an attack on the World Senate (because they're proposing new energy use laws). Hunters are dispatched to deal with the armed attackers.
- A forest base where researchers were working was attacked and files were stolen, hunters are dispatched to locate the researchers, extract them and recover the files. Unfortunately they run into resistance in the form of twin mavericks. (Illumin Fungus and Growth Gastonia.) The hunters manage to best both mavericks.
- The city's aquaducts were taken over by a maverick (fittingly named Aqua Duck) in an attempt to show the humans how energy regulation would be devastating for reploid kind, Alia dispatched the hunters and the maverick was defeated.
- A munitions dump was attacked by mavericks in a seeming attempt to increase their weapon supply. Blast Baboon is on scene supervising the operation. She gets taken down by the hunters... but she plants the idea to rebel in some of the hunters.
- A scrapyard was being raided by a maverick (Metal Mongoose). Hunters are dispatched to prevent the maverick from making off with more parts to create further mavericks. (This is where Sigma's parts were buried.)
- The central city mines came under maverick fire (Dust Dragonfly). The attack was stopped by the hunters, but Dust's true objective was to steal data from the mining company about a past project they had supplied materials for...
- While Alia was working on a report, the power station goes offline. She dispatches the hunters immediately when the power doesn't return. The hunters end up fighting against a maverick (Tetravolt Termite) that can absorb electricity and was returning the stolen power to the maverick base.
- The data from the mines was decoded, revealing the target of the Mother Elf's burial ground. Alia dispatches the hunters to secure the Mother Elf before anything goes wrong. Unfortunately a maverick (Danger Doberman) is already waiting for them. The battle ensued, but just when the Mother elf was secured, the maverick's leader showed up and captured the Mother elf.
- The hunters learn that Sigma's parts were the ones stolen from the scrap yard, thinking he is revived again, Alia dispatches the hunters to X's grave. Where they find Sigma... Set to destroy the sleeping hunter. The hunters do battle with Sigma, beating him and securing X's sleeping body.
- Alia tries to contact Dr. Weil to examine Sigma's body to prevent Sigma from returning... But Weil doesn't answer. Alia grows suspicious. Then a message states that Dr. Weil has been captured and is being held at the floating senate building. Lumine then reveals his presence and explained his plot to keep the hunters busy, remind the populace of the maverick wars then take over. Lumine is defeated though.
- Omega is then revealed, being controlled by Dr. Weil. The hunters engage the powerful reploid and win... Until Weil uses the Dark Elf to power up Omega. X arrives and aids the hunters in fighting Omega. Finally the hunters manage to defeat Omega by X sealing the Dark Elf inside himself then using it's power against Omega.
- In the end, it's revealed (to players only) that Lumine was posing as Dr. Weil in the final showdow (Lumine had used a copy of himself so it appeared like he was killed by the hunters). Lumine was the one who stole the mother elf and forced Weil to turn it into the dark elf. Lumine was the one who unleashed the super reploid (Omega) onto the Hunters. Lumine was also the one who dumped the real Dr. Weil and fled the scene, setting up Dr. Weil to take the fall for his actions.
2260 - Destiny In Arms (85 years from CA to DIA and several months after AR2)