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I think Groudon learns Solar Beam at level 60 or around there but don't teach it Solar Beam. 2 turns plus 10 PP=Bad. Just teach your Swampert Ice Beam and it'll take care of Drake in about 5-7 turns.
solarbeam on groudon is a common "mistake"... though it's one turn fire due to auto-sunny day effect, it's still a terrible attack due to lack of STAB... and in comparison to Groudon's physical attack power, the 270ish special attack is nothing...