Kei Lavonne and Niomi Collard were strangers until Saturday, when they spotted each other’s “gorgeous” outfits on their way to Pokémon GO Fest at Grant Park.Lavonne, 35, came from South Bend, Indiana, and dressed as the Pokémon character Mimikyu, a ghost that disguised itself as the famous Pikachu because it desired more love. Collard, 34, flew from Tampa, Florida, for the fest and didn’t cosplay as a character but wore a glamorous purple and pi…