Well it depends on what you are basing it off.
Anime or Games?
In the Anime moves like String Shot can be rather handy to tie up opponents, but in the game they don't really do anything =/
Also in the anime you could use things to get rid of spikes like gust. Be more creative in general if it was like that, where as the games only do certain things.
Gengar or Pidgeot. They would be able to do so much and you could be really creative with them.
Games - Venasaur. Sleep Powder and Leech seed is the way forward!