I'm trying to build a defensive team for use in both Single and Double Battles but I can only think of the Pokémon I'm 100% sure I want on my team.

What are good teammates for the following Pokemon?

Bold Venusaur @ Venusaurite

>Substitute/Roar
>Giga Drain
>Sludge Bomb/HP Fire
>Leech Seed/Synthesis

Bold Clefairy @ Leftovers

>Cosmic Power
>Moonblast/Follow Me
>Stored Power
>Softboiled/Moonlight

Bold Slowbro @ Assault Vest

>Fire Blast
>Psyshock
>Ice Beam
>Scald