What hurts rock/ground types the most is water type. NEVER EVER use an Electric type against rock type.
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Rock Slide: TM no.48 Effect: Deals non-contacting damage to the foe Pokemon. Has 30% chance to flinch the opposing Pokemon In Battle: Hurts both Pokemon in Double Battles Power: 75 Base Power (BP) Accuracy: 95% Type: Rock
dark type
The types that are super-effective against ground Pokemon are Water and Grass.
usually grass or electric
Gyarados is a water type. Water type Pokemon are weak when battling a grass type Pokemon.