General rule; when we talk about "Kalos-Native", it basically means the blue pentagon exclusive to Pokémon caught, bred or otherwise obtained in Gen 6 - that a lot of the time are the only ones allowed in tournaments, yeah.Thank you !
Hum... you are talking about Kalos but maybe you mean ORAS's Hoenn ? Because Raikou is not catchable in XY versions, as far as I know...
But yes I would like to play with it in games/tournaments allowing only Pokémon from XY or ORAS.
About RNG manipulation I know that I can have 50% chances to get the right nature with my leader with the same one and the "Synchronize" talent, but for IVs it's a lot more randomized I think... isn't it ?
RNG Manipulation was a thing that existed in Gen 4 and 5 and was generally the only feasible way to get competitive Pokémon back then. But yeah, in that case you're gonna have to hunt around the wi-fi forum a bit. Orange Islands is more for discussion rather than actual trading and such.