Last night at one in the morning when I couldn't sleep, my mind did the only logical thing to do: began mixing Pokémon and Gravity Falls. That's when I had this question.
In the final showdown of the ORAS Delta Episode, you face off with Deoxys. He comes out of a red triangle, as can be seen below.
Now this triangle looks like the diabolical and also triangular Bill Cipher, but that's beside the point.
I began wondering, what's the significance of Deoxys' triangle? This isn't the first time it's shown up. In ye olde Ruby/Sapphire/Emerald/FireRed/LeafGreen events for Deoxys he is found on Birth Island, seen below.
Now the most striking feature of Birth Island is its triangular shape. You will also notice Deoxys' trademark otherworldly triangle sitting in the middle, and after you corner it the alien will attack.
The triangle hasn't made its last appearance, as upon rematching Deoxys in ORAS (if you KOd him in space) you will find his otherworldly triangle waiting for you at the top of Sky Pillar. (Image not included because bigness.)
So what is the connection between Deoxys, the Pokémon from space, and his triangle? The first thought that occurred to me was that it represented the delta (∆), fitting in with the Alpha and Omega theme of the games as well as the title of the Delta Episode. But this triangle has been around since the third generation, before Omega Ruby and Alpha Sapphire were even a concept. So was Deoxys' triangle just a coincidental feature of the appropriately named Delta Episode?
Or is there a deeper meaning to Deoxys' triangle?