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Can anyone confirm for me if you keep a pokemon from evolving (to learn certain moves faster), but evolve it later, will it automatically adjust the stats to what they should be for the new form? I know I've seen some significant power jumps in evolutions, I was wondering if this would be the same case.

Actually, yes that is what I was asking.

Also, it is more important because I want my oddish to learn (whatever move it was that i wanted it to learn) and then go straight to gloom and then bellossom (or Vileploom, I actually haven't decided yet. It basically goes down to either special attack or special defense). In this scenario, it's actually beneficial to wait then.

Also, I don't have the time to spend in the underground getting heart scales for that fatty

Yeah, you can. He asks you to bring him a certain Pokémon, the pool from which he chooses is all of your Seen Pokémon in the Pokédex. It's a bit of a pain, though.

If you're referring to Flygon, it is (brokenly) immune to Earthquake, even while underground.

On a different note: Several pokemon only learn moves IF they don't evolve. Bulbasaur, for instance, learns Seed Bomb... at level thirty-seven, past the point at which it can evolve fully to Venusaur. Another consideration to make is that Heart scales only work on moves that occur naturally in a Pokemon's movepool. You won't be able to recover TMs with it, and you assuredly can't learn hidden tricks like that one unless you get it and keep it prior to and throughout evolution.

Just as an example, Trapinch originally learned Dig well past its evolutionary level--only for its higher forms to never receive it. For an alternative case, consider Ninjask, whose lower form gets MUCH different moves.

Of course, I'm someone who keeps a level 100 meowth around, so what do I know?