Lillipup is a pretty good team member early on (It starts out with Take Down, gets Crunch pretty early, the elemental bites are decent coverage, and Strength makes for a decent STAB attack) and as a Stoutland it holds up pretty well, but you may feel that it's falling off around 7th Street-Agate Circus. (You can get it right before the second gym, it just takes a few step which can be found on this site.) Intimidate is a great in game ability, so that's another bonus for it. (gotta make sure it gets vital spirit as a Lillipup, as it changes to Intimidate when it evolves)