I think he'll get Hippopotas. Definitely. If Misty ever returns for about 2 eps more, she'll have an Eevee (which evolves to Glaceon) and a Finneon. And Brock should get a Stantler, even though no way is that a 4th gen. Dawn'll get Mareep, and May'll get Rapidash and maybe a Hippopotas as well, since they both had Bulbasaur in the last gen, and Hippopotas just suits May. That's what I think.