You can't - it's exclusive to Pokémon XD - Gale of Darkness.
If you're trying to get one to evolve Eevee into Espeon, the only way is to achieve a happiness level of 220 or above and level Eevee up during the day.
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The moon shard was in a Pokemon movie, and it was apparently given out as a Promo item, along with the sun shard.
Red Shard Blue Shard Yellow Shard Green Shard Violet City and Fuchsia City
sos una puta
yellow shard and red shard and green shard
Blue Shard- Route 124; Wild Pokemon. Green Shard- Route 126; Wild Relicanth. Red Shard- Route 124; Wild Pokemon. Yellow Shard- Route 126; Wild Pokemon.