K Charizard without Solar Power is an easy kill. also, if you switch Charizard into a Stealth Rock (very common EH), it loses 50% of its HP right off the bat. Venosaur. gets HP recovery moves in Synthesis, but in Rain, Sand, and Hail, it pretty much blows. Blastoise is slow, but if you run a good set, i'd say that's the way to go.
Blastoise @ Focus Sash
Impish Nature
Torrent
252 Def/ 160 SDef/ 32 HP
- Counter
- Aqua Jet
- Rapid Spin
- Toxic
that's what I say.