As you walk through the forest, you hear a great commotion, you peek through some bushes and see most of the legendary Pokémon having some sort of meeting.

The Three Birds: (Arguing.)

Mewtwo: (Playing with Mew.)

Groudon and Kyogre: (Hitting each other.)

Rayquaza: (Trying to stop Groudon and Kyogre from fighting.)

Deoxys: (Trying to sneak attack Rayquaza.)

Jirachi: (Staring into space.)

Palkia and Dialga: (Talking to Arceus.)

Giratina: (Plotting against Arceus.)

Arceus: And thou shall not lie, thou shall not cheat, thou shall not get caught or you’ll end up just like he. (Points at Giratina.)

Solgaleo: (Chasing a red laser like a cat.)

Lunala: (Pointing the red laser.)

Necrozma: (Eating light.)

Koraidon and Miraidon: (The only ones who noticed the user.) And who might you be?

You’re a bit confused after seeing all this, I mean, why are (almost) all the legendaries in one place? Guess you’ll have to find out.