Shiny Pokémon are a rare variant of Pokémon in Pokémon Vortex. All Shiny Pokémon in Pokémon Vortex have 25% more HP (Level 100 Pokémon have 500 HP instead of 400 HP).
They have the same sprites and same colors as Shiny Pokémon in the games. For example:
This Shiny Munchlax is a different color. However, you cannot catch a Shiny evolved Pokémon, as all evolved Pokémon can only be caught in the Normal Variant. Shiny Legendary Pokémon, however, can be caught.