Pokécharms

He probably just left it in the PC and was walking around with only 5 in his party, searching for a Gastly or the ghost at the top floor to add to his party, then he settled on Exeggutor later.

Well said, and strongly agreed with. (:

Also, we do know that we only ever see a fraction of what he caught, assuming that he always tells the truth...

Blue is all about power and being better than everbody else. Exeggutor has better stats than Raticate, and he wanted to use Exeggutor against Agatha (because Psychic-Types were immune to Ghost-Types back in Generation I), so it was even better.

Very true, though it must be recognized that his rats with hyperfang early on do tear a hole in your team, especially in a nuzlocke...

Yea XD Also, they didn't have Pokemon evolving at an earlier level than their supposed to until Ghetsis' Hydreigon in Black and White, being at level 54 instead of level 64, where Zweilous would normally evolve into Hydreigon. But it is explained that if one head beats the other head (their constantly fighting for complete control over the body), then they'll evolve into Hydreigon.

Meaning that Ghetsis lost his arm trying to force Zweilous to evolve early, by forcing the other head to become a vegetable, or essentially kill the life in that. Hydreigon's two other heads are puppets of the main one, and don't have thought to it.

Yes, they do. But he needed a Grass-Type (if started with a Charmander or a Squirtle), and a part-Psychic-Type was the next best thing in the battle against the Elite Four.

Well that's a happy thought...

Also, Hydreigon cannot be found in any part of Unova. Only Deino in both Black/White on Victory Road, with Zweilous appearing in Black 2/White 2 on Victory Road (all the Deino evolved into Zweilous in the 2-year gap between Black/White and their sequels).

You must admit that Venusaur was the best Kanto grass type though...

Ghetsis is even shown to have a black arm when crowning N as the leader of Team Plasma, and his sprite shows he doesn't have his arm anymore after that, showing that the ceremony for crowning N was a few months before the start of the main player's journy in Black/White.

Yes, it is Best start and end to your journey trouble in the middle, but who cares? XD

Also, I'm assuming that the time he lost his arm to the player's journey was a couple of months. I don't actually know XD so yea...

Guess what else is a happy thought XD

I'm going out on a limb and assuming that gen 5 was your favorite... Is this incorrect?

XD No, Gen IV and II XD but Gen V is close

What else is a happy thought...? (I'm rather worried now)

Guess how Cyrus evolved his Golbat into a Crobat with how cruel and emotionless Cyrus was XD (Crobat cannot be found anywhere in any games)

Great choice on gen four! You'd be relatively hard-pressed to find someone who doesn't like gen four though to be entirely honest...