None of the Grass-starters, and very few Grass-type in general, learn Surf. If they could, they would have a guaranteed way to handle the Fire starter; this is a little unfair, considering Water-types have access to Ice Beam, but they get sort of a pass due to ice just being solid water.
Torterra DOES have a way to deal with Infernape, through Earthquake, but that was the intention of the typing of the trio - each having an edge on the other, each being weak to the other through some move or another.
