ITT: Buff a move reasonably or give a Pokemon a move/ability they should have. Or just change them for what they should be in your opinion.

Give Mew Protean.
Give Quiver Dance to Lumineon.
Give Snorlax Slack Off.
Howl now lowers the enemy's attack by one stage in addition to boosting your own.
Florges is part Grass after fusing with the flower.
And an oldie, give Ampharos Tail Glow. Yes, I know it means originally means Firefly Light, but if Manaphy can get it and the Pokemon it's based upon is a bioluminescent sea slug, I see nothing wrong with Ampharos getting it.