@ Lockeness: Alakazam is just bad. A huge part of being good in GSC is providing defensive synergy, of which Alakazam offers none. At least Marowak offers an Electric immunity and Cloyster can scare out some Ground-types. Furthermore, its offensive impact is just so underwhelming considering the defense you're giving up to fit it on the team. Walls like Snorlax and Tyranitar are everywhere, and Alakazam has awful attacking coverage; its movepool is almost entirely support-based.
I don't think Tenta or Kanga should be bumped up, though. They're both effective, but Tenta's usage has mostly evaporated since its heyday whereas Kanga is just a gimmick at this point. Heracross is used a lot more often than these two are, and is more consistently effective, too.