How to build a good Pokemon team?

[Mnementh]

Cleary397 said:

Secondly, there really is no need to have multiple moves of the same type on a pokemon. A Rhyperior with 2 ground type moves is a waste. You want the STAB (same type attack bonus) from having a move of the same type, but pick the best move possible. In the case of Rhyperior, have earthquake. Not earthquake and drill run. 

Having a diverse set of moves on pokemon allows you to potentially deal with some threats other players will put out against your pokemon. 

Having only one attack of each type makes sense, as fights against other humans never last long and you will not use the inferior move. That brings me to following list for each type (only looking for power as a start, using http://www.serebii.net/attackdex-xy/ ):

Bug: Megahorn

Dark: Foul Play (seems to use enemies attack power)

Dragon: Roar of time (as the user has to rest the next turn, it might be counted as power 75, so maybe Draco Meteor)

Electric: Bolt Strike

Fairy: Light of Ruin (damages the user, so maybe Moonblast)

Fight: Focus Punch (but only with high speed)

Fire: Blast Burn (as the user has to rest next turn, maybe Blue Flare or Overheat)

Flying: Sky Attack

Ghost: Shadow Force

Grass: Frenzy Plant (again, as the user can't move on the next turn, maybe better Leaf Storm)

Ground: Earthquake

Ice: Ice Burn

Normal: Explosion and Self-Destruct have obvius downsides (maybe last resort), so maybe Giga Impact or Hyper Beam

Poison: Gunk Shot

Psychic: Psycho Boost

Rock: Head Smash

Steel: Doom Desire (probably not good because of the delay, maybe Iron Tail)

Water: Hydro Cannon or Water Spout

Is this the right way to look at things? Probably some of the other moves aren't that good either, must try.