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Prevents the opponent from attacking for 2-5 turns. Either Pokémon may switch at any time, but the user is only permitted to use this attack until the 2-5 turns are up. If the target switches, the duration of this attack will be renewed and an additional PP will be used. If the user switches out, the target is still immobilized for the duration of that turn. All the hits will do the same damage as the first hit. If the first hit is a critical hit, all subsequent hits will be critical hits too.
RBY partial trapping moves might be the most obnoxious moves ever. For its duration, the target will be able to switch but it won't be able to attack. It gives the user free switches and it slowly gets your health down until you are in KO range. It's a move basically used to buy turns and win very, very slowly. Clamp is used by Cloyster once the opposing team is paralysed or to get free switches. The only reliable check to this tactic is to paralyze the Clamp user or try KO it before it starts using Clamp. Another way to go through it is to select an OHKOing move waiting for Clamp to fail. All in all, a very annoying tactic.
Bind is a Normal-type equivalent with lower Base Power.
Wrap is a Normal-type equivalent with lower Base Power and more accuracy.
Fire Spin is a Fire-type equivalent with lower accuracy.