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And we're drifting away from Pokemon discussion :P, so getting back, as much as I like Pidgeot, both it & Fearow are replaceable, although I've always used Pidgeot throughout my playthrough, whenever I have it on the team.
If I use a Poison type on my team, I usually use one with another typing, like Venusaur, Nidoking, Gengar, or Crobat. Although, if Weezing was Poison/Fire or Poison/Electric, it'd have a higher chance of making it into my team.
Venusaur is one of the best Poison types. And aside from the ones I listed in my last post, I also like Venomoth, Victreebel, Tentacruel, Roserade, Skuntank, Drapion, Scolipede, Dragalge, Salazzle, and Toxapex.