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From Pokémon Fan Game Wiki

One of the new types offered in Pokémon Treasures as well as Pokémon Weather, originating from Project Pokémon Creation

Here are its type affinities:

• Super Effective Against: Electric, Ghost, Dragon, Dark, Cosmic
• Not Very Effective Against: Ice, Poison, Steel, Crystal, Wind, Light
• Inneffective Against: Grass
• Resistant to: Psychic, Ghost, Light
• Vulnerable to: Fire, Fighting, Poison, Ground
• Immune to: Nothing

Overall Type Rating: -8

Light is best suited with dual-typing to cover it's various weaknesses offensively and defensively.