You should customize your 'rangs like this

Mono: Multi stone
Duo: Fire & Zoom stones
Lash: 3 Warp stones
Mega: 3 Mega stones and 1 Air stone
Smash: 2 Zoom Stones, 2 Earth stones and 1 Multi stone
Ring: 3 Earth stones and 3 Warp stones
Doom: 3 Earth stones and 1 Magnet stone