Question

Mine knows:

Signal Beam: Decent power, high accuracy, chance to confuse, used to deal with Dark types.

Shadow Ball: Good power, high accuracy, decent chance to lower Sp. Def, used to deal with Ghost types.

Power Gem: Decent power, high accuracy, used to deal with Bug types.

Psychic: Good power, high accuracy, chance to lower Sp. Def, STAB.

Grumpig learnset

Comments

I Think That Is Good Moveset ( I Dont Own Grumpig)

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Grumpig (M) @ Leftovers
Trait: Thick Fat
EVs: 196 HP / 136 SAtk / 176 SDef
Modest Nature (+SAtk, -Atk)
- Thunder Wave
- Psychic
- Calm Mind
- Hidden Power [Ground]

Answer 1

This set is good. Maybe carry Magic coat to deflect entry hazards and catch people off guard.

Answer 2

I always liked energy ball for grumpig but if you don't want that, yours is a good movset too.

Answer 3

Gen V

Grumpig (M) @ Leftovers

Trait: Thick Fat

EVs: 64 HP / 128 SAtk / 176 SDef / 140 Spd

Modest Nature (+SAtk, -Atk)

• Thunder Wave
• Shadow Ball
• Psyshock
• Calm Mind

Answer 4

Grumpig @ Leftovers

Trait: Thick Fat

EVs: 252 HP / 4 Def / 252 Spe

Timid Nature (+Spe, -Atk)

• Calm Mind
• Psychic/Psyshock
• Shadow Ball
• Focus Blast

Calm Mind raises Special stats, making it dish out more damage and take special hits better.
Psychich is STAB, Psyshock can be used to hit special walls harder, but Psychic is generally better unless you're after a specific target.
Shadow Ball complements both moves nicely and hits Ghosts and Psychics.
Focus Blast rounds out the coverage hitting Dark Steel and Normal types, mainly.
252 HP / 252 Def / 4 SpD is an option if you want to have physical bulk, but it generally sucks because the lack of recovery outside Lefties.

Answer 5

Payback could be good, but grumpig do have great special attack...

Answer 6

Grumpig (M) @ Leftovers
Trait: Thick Fat
EVs: 100 HP / 252 Def / 156 SpDef
Bold Nature (+Def, -Atk)
- Psyshock or Calm Mind
- Thunder Wave
- Seismic Toss
- Focus Blast or Calm Mind

Psyshock for STAB.
Thunder Wave for crippling.
Seismic Toss to make use of not great attack stats.
Focus Blast for hitting Dark types.

Calm Mind is an option, but if you have calm mind you wont be able to hit either ghost types or dark types.