>>36071145TMs can easily be locked to postgame, and most things have enough options to keep up until you finish the game anyway. USUM gave you Seed Bomb at Ula Ula beach with a super-easy "grinding" method in Mantine Surf.
>Chesnaught, Torterra, AbomasnowIf they need more power, Wood Hammer is fine. All of them would rather have Horn Leech than a buffed Seed Bomb anyway (even if that'd make no sense)
>FerrothornIf it needs more power (which it honestly doesn't) Power Whip is fine. Once again, it'd rather grow a tree on its face so it could use Horn Leech.
I'll give you Simisage and maybe Breloom, but neither of those need it to be a TM since they pick it up by level anyway. Same goes for Gourgeist, who really wants to be a Special attacker above all else.
I'm really not convinced that getting yet another 90 BP physical attack with no notable side effects is going to fix whatever's wrong with Grass.
>No.Why not? Does Celesteela really need to be any better? Or are you more concerned about leaving the early-game Bugs that learn Stun Spore in the lurch? Everything that learns Leaf Storm is already Grass-type so I guess it doesn't matter either way.