Quo vadis gym battling?

Dragon: Dragonite, Water: Blastoise, Fire: Arcnanine Grass: Exeggutor, Rock: Rhydon, Electric: Jolteon Ghost: Gengar, Physic: Hypno Poison: Muk, and Normal: Snorlax
Omitted a few categories but I would have fun facing those. Don't really care for ice or steel Mon.

It would be great if every kind of pokemon good be only ones in a gym. And if you can only attack with different kind of pokemons. It would bring some dynamic to the game.

What will be yours defending 10?

Snorlax
Gyarados
Dragonite
Rhizeros
Vaporeon
Flareon
Exeggutor
Machamp
Slowbro
Poliwrath

This change would weeken gym's defense a bit. They could make an additional change to strengthen it: Just no upper limit, only raising costs for prestiging, and one pkm-per-type-limit. It would be funny to see level-20-gyms with Golduck, Nidoqueen and Magneton as defenders. :-)