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re-reading this arc and honestly it's fucking incredible how everything worked like pottery for PokeSpe
A wild Salamance attacked the laboratory and set free Rayquaza who was being held by the pokemon association for research. Fast forward ORAS arc and Zinnia has a Salamance in the games, it was really easy to write her as the one who actually attacked the laboratory in order to free Rayquaza. which completely makes sense for her goal