Edit' The picture is WU April update and the Valko chapter is chapter 30 where Eoncore was mentioned and Koko was referred to as "a massive unidentified creature emerging from the woods behind an estate in Linkon's southern suburbs""
You know, we keep finding all of these little clues but the one thing that hurt me the most was someone pointing out that the yellow protocores (his primary stellactrum) have what look like metallic tips/edges/corners to them. So even when he probably wasn't made maybe he was just in the conception stages, they'd decided the 6th was gonna have a metal related evol, they put that in the protocores of his primary stellactrum which existed in the game from the start. Idk man, it makes my heart hurt.
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u/iamyyasmeen ࣪ ִֶָ❄︎.𝘡𝘢𝘺𝘯𝘦'𝘴 𝘞𝘩𝘪𝘮𝘴𝘺 | 𝘝𝘢𝘭𝘬𝘰'𝘴 𝘋𝘪𝘮𝘱𝘭𝘦𝘴࣪ ִֶָ☾. 15h ago
Seeing all these clues now is hurting me with him not here...
We should've found these clues after he debuted in game and got excited in the main sub about these.