Next time, refer to
Black / White's Quick Question thread for this kind of thing :3
Are you looking for EV Training spots or just overall experience?
Just a quick comment on your movesets, though.
Pelipper
Ability: Keen Eye (Rain Dish is optimal, though)
Nature: Hasty (Hasty is bad because it lowers your DEF... Bold)
Move 1:
Toxic
Move 2:
Roost
Move 3:
Scald
Move 4: Hurricane
Pelipper's main trait is that it's defensive, so you should try to run as defensive a moveset as possible. Scald's burn effect will halve the foe's ATK to make you resist them better, but since it's only 30%, you have Toxic to damage the foe otherwise. Roost is for healing and mitigating weaknesses to Rock / Electric while healing. Hurricane has good power to compensate for Pelipper's weaker offenses.
Pelipper
Ability: Keen Eye (Rain Dish is optimal, though)
Nature: Hasty (Modest)
Move 1:
Agility / Roost
Move 2:
Ice Beam
Move 3:
Scald / Hydro Pump
Move 4: Hurricane
This set is more offensive than the last. Unfortunately, Pelipper doesn't have anything to boost its weak SpATK, but it has Agility to help it's SPE. In Rain, Pelipper shines with its double STAB moves. Hydro Pump hits harder, but Hurricane always hits (and can confuse). It's best to run this with an ally with Rain Dance (maybe an Electric-type). Ice Beam for coverage.
Hydreigon
Ability: Levitate
Nature: Quiet (this is pretty bad for Hydreigon, since he's a special attacker)
Move 1:
Fire Blast
Move 2:
Crunch / Stone Edge / Rock Slide
Move 3:
Earthquake
Move 4:
Outrage
Since you're at a disadvantage Nature, you'll want to run a mostly Physical set. Run Outrage as your primary attack; it's powerful, but be wary of getting locked in on an Ice-type on the following turn. Earthquake is powerful and has amazing coverage. Crunch can be used as secondary STAB and coverage for Psychic / Ghost types, but Stone Edge / Rock Slide can be used as well, depending on your team composition. Stone Edge is more powerful and can crit easily, but Rock Slide is more accurate and can flinch. Fire Blast for Steel-types.
