Instead of a legendary trio, I'd like to see Nintendo introduce four legends, each representing a different season, It would also be interesting if each legend could only be obtained during its season. I know Articuno/Zapdos/Moltres were influenced by seasons, but I'd love to see four Wolf like Pokemon as legendaries, here's my prediction:
Spring: Grass / Summer: Fire / Autumn: Ground / Winter: Water
I'd love to see this, mostly because with the above types each Pokemon has a type advantage over the one that comes before it and a type disadvantage to the one that follows it to represent how seasons replace each other.
I second this idea. It would be good for the notice of seasons. Since seasons will be a main support for this game; seasonal legendaries could be a fresh new twist in the game.
As for the main mascots, before I never really liked Zekrom all that much since to me it's kind of bland being a dull black, but now it's starting to rub off on me. I still prefer Reshiram since it looks like an angel. xD;