There are several red Pokemon that aren't Fire type. The number of red Pokemon that aren't Fire type far outweigh the number of red Pokemon that are Fire type (46-21).
Originally Posted by Griever789
Since Groudon is the protector of the land while Kyogre is the protector of the seas, Groudon has Drought as a reference to his loyalty to land. It is not some battling gimmick that is supposed to increase his attack, it is only to show him preventing the rainwater from "destroying" his precious land.
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