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Good thread OP, lemme throw some mons in.
>Azumarill in BW2, ORAS, and XY
Their pre-evos can be acquired really early on. They evolve at level 18 and can either completely and utterly wall two types with Thick Fat and respectable bulk or be an absolute menace with Huge Power. Is especially powerful in the gen 6 games because they get access to fairy typing and their associated bullshit.
>Umbreon, Espeon, and Sylveon
Eevee can be acquired early in a decent chunk of the games, and these three are the easiest evolutions of theirs. All of have pretty good stats, and can be either be evolved on the first level-up (Espeon & Umbreon) or at level 15 (Sylveon).
If we're allowed to include romhacks, I've been playing Renegade Platinum a lot recently and while a lot of mons have been buffed into being useful, Trash Wormadam in particular sticks out to me.
>catchable on the second route
>evolves at level 20
>bug/steel is a phenomenal defensive typing, with 8 resists, 1 immunity, and only one weakness
>got buffed to have 100 defense and sp. def and 110 special attack. hp sucks dick but there's an ev training spot in solaceon
The only thing coming close to holding it back is that its evolution is behind two layers of jank.