>>38017829All the good ones (excluding megas. tangrowth, amonguss, serperior, tapu Bulu, kartana, breloom, Ferrothorn and chestnaught) are because they are so good they could abuse grasses niche to the fullest unlike most if it's peers and/or don't share common grass flaws that suck shit.
Most of these listed have great movepools, good typings, amazing abilities, niche resistances.