How to get?

Simple, kinda..?

You have to go on loomain legacy.. Beat first gym if haven't.. Then teleport to trick retreat (halloween event) and walk around to find a purple and black door and then you enter it... It leads you to the forsaken realm in noli's map.. You walk up to noli and battle him... He uses Metronette.. (Do not worry, if you have bad team... It forces you to have a good team) pretty much the battle is easy... Then once you defear Metronette... metronette and noli fuses.. Yes, they fuse... Into a raid boss named "Noli x Metronette" if your bad at loomain legacy then watch a tutorial. If not, then it should be easy for you.. (It took me 3 tries.. Coz, I was learning what moves it had...) Once you beat the raid boss.. You get Metronette halloween re-skin as a loomain.. And a badge which gives you the new noli skin, Metronette..