Woobat is useful for first gym leader Venam since she is poison type trainer, but best if you ve got resistance against dark type move cause many poison type pack dark type move~Misdreavus is probably not a good idea since it learns psychic type move in the very late stage but you can keep it in rotation~Spewpa evolves into Vivillon which learns psybeam quite early in game, pretty useful, make sure you catch those with ability compoundeyes, it will boost accuracy, which may help with powder moves(para, sleep etc)~i dont know which mode you play, dont expect to OHKO with SE moves(been there, and i tell you, it is devastating), but i find trubbish acid spray to be quite handy too, severely lowering down special defense and then OHKO, plus it has got resistance to Venam's team