Latias & Latios
From the Super Mario Wiki
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Latias and Latios are both Legendary Dragon/Psychic-type Pokémon introduced in Pokémon Ruby and Sapphire Versions and both known as the Eon Pokémon. Latios is blue and exclusively male, while Latias is red and exclusively female. As of Generation VI, Latios and Latias are capable of Mega Evolving into Mega Latios and Mega Latias, respectively.
Both Pokémon appear in Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS / Wii U as Poké Ball Pokémon. When one of them is summoned, it flies off-screen and both fly diagonally across the screen one at a time to strike opponents with Steel Wing multiple times.
Super Smash Bros. Brawl
Super Smash Bros. for Nintendo 3DS / Wii U