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Celebi : hi dialga!
Dialga: *roar* (hi my child)
Meanwhile in pmd:
Shiny celebi : *nervous tone* hi/ bye dialga.
Primadel dialga : *angry roar* (get back here-!)
How Celebi and Dialga greet other while time traveling.
Based on a meme I found on Twitter which was so hilarious that I just had to draw it.
Plus a Mystery Dungeon variant with Dark Dialga menacingly greeting a terrified Shiny Celebi.