Catching Volcarona
After beating the story, the sand will rise in B5F of the Relic Castle to gain access to a new room. Go through the passages (which is kinda a maze) until you reach the bottom floor. Inside the chamber where Ryoku of the Seven Sages is standing is where Volcarona is. He's Fire/Bug type. You can also get him by evolving Larvesta, which you get given as an egg from a lady in a house in Route 18.
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