For example:Rain Dance and Thunder, Solarbeam and Sunny Day, Charge and any electric attack, Focus Punch and Substitute, Rest and Sleep Talk (Though it doesn't add anything it does allow snorlax to kill and heal thus becoming both staller and a minor sweeper if well trained), Roar and the Switching moves (Spikes stealth rock and toxic spikes).
Are there any more because I only just found out about rain dance and thunder.