You don't need to use an evolution stone to evolve Venonat. It evolves to Venomoth at level 31.
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You need to reach level 40, I believe. No special evolution items are needed to evolve Wailmer to Wailord.
Clefairy will evolve when a Moon Stone is used on the pokemon. Go into the Bag and find a Moon Stone press A on it then Press A on Use then go to Clefairy press A and the evolution will begin.
Deino evolves into Zweilous at level 50 which is the highest level that the first Pokemon of a 3-stage evolution evolves. Deino doesn't evolve with a stone.
You can't evolve it with a stone
The number of Pokemon that need to use a certain stone to evolve, for each stone, is a tie between the Water stone and the Moon stone. Nidorino, Nidorina, Clefairy, and Jigglypuff need to use the Moon stone to evolve. Poliwhirl, Shellder, Staryu, and Eevee (special case) need the Water stone to evolve.