To the left, you've got Wailord, as it appears in Pokemon Sun and Moon. To the right, you've got Wailord from the Pokemon anime. Notice a difference?
As Instagram user xeogran noted recently, Pokemon Sun and Moon does not capture the sheer magnificence that is Wailord. This Wailord is too small!
Sun and Moon are the first games in the main franchise which show trainers standing behind Pokemon in battle. While downscaling monsters to fit the screen is nothing new, looking at an 11-year-old stand tall against a creature based on a blue whale is silly. Wailord is supposed to be one of the biggest creatures in the entire game, ostensibly even a baby Wailord would be enormous next to a trainer. (According to Bulbapedia, Wailords are around 14.5m and can weigh around 398kg.)
Literally unplayable, Game Freak.
Reader @sirboulevard points out that Colosseum got it right when it displayed Wailords that would obscure nearly the entire screen: