It sounds like you're referring to a or a fangame based on Pokémon Ruby (Rubis being French for Ruby), possibly titled Pokémon New Rubis with mechanics involving Shadow Pokémon (like in Colosseum/XD ) and a "Normal Down" mechanic (perhaps lowering Normal-type effectiveness or removing the Normal type from certain moves/mons).
Note: Since this keyword appears to reference a specific fan-made ROM hack or a concept mod (mixing French influences from "Rubis" [Ruby], "Shadow" Pokémon from Colosseum/XD, and "Normal Down" stat mechanics), the article is written as an in-depth guide, review, and speculation piece for a hypothetical or leaked new game version. Pokemon Version NEW Rubis - Shadow -Normal Down...
This crushes the current "Balanced Normal" meta. Pokémon like Snorlax and Blissey are now high-risk, high-reward. You cannot spam Body Slam anymore without managing stat stages. It sounds like you're referring to a or