The Psychic-type is very weak against the Dark-type such as houndour murkrow tyranitar...Pokemon.marriland.com is a great reference. He plays them all and is playing Heart Gold or Soul Silver now probably.
Ghost Bug and Dark
Ghost, dark and bug type moves.
super effective is bug
The first guy has dark Pokemon. Fighting is super effective against dark. The second guy has ghost Pokemon. Psycic is super effective against, but beware: ghost is super effective against psycic. The third guy has ice Pokemon. Fire obviously is super effective against Ice. The last guy has dragon Pokemon. Dragon and ice are super effective against dragon. The champion has water Pokemon, but one of his Pokemon is water and ground. Electric is very good against water, but it doesn't effect his water and ground Pokemon. Grass is very good to use against his water and ground Pokemon.
Bug, ghost, and dark types are most effective against psychic types.
Ground and bug types.
No. Ghost and Dark is super effective to Psychic Pokemon. Fire is super effective to Grass, Steel, Bug, and Ice.
Ghost and Dark attacks are super effective against Ghost type pokemon.
I think none, But if you're Pokemon can learn Ice moves. It will be super effective towards grass.
Steel is super effective against rock type pokemon.
using super effective Pokemon against his' Pokemon you'll need a super effective Pokemon against his starter but you don't need to win with super effective Pokemon just stock up on potions that's what I do.
ground type Pokemon are super effective against poison type Pokemon.