1. Charizard
2. Blaziken
3. Gengar
4. Crobat
5. Tentacruel
6. Swampert
7. Arcanine
8. Typhlosion
9. Kingdra
10. Flareon
11-50. TBD

The best mons have high BST, are immune to poison/burn/sand, and have good physical and special STAB options.