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Okay, figured out Porygon since someone asked, and because I wanted to see if I could figure it out myself. In spoilers because I'm sure there's at least one person (other than me) who wants to do it all on their own.
1. Switch the lone Gible with Pidgeotto to get rid of the Gibles.
2. Move the Porygon at the bottom middle to make a match with the Porygon in ice, getting a 4 match of Pidgeotto in the process.
3. Figure the rest out for yourself!