Forest
Great, another Aerodactyl and Gengar here, now that's a huge surprise.
'shrug' I'll send out Spectre to say hello to his ghostly counterparts (including the other Gengar), and I'll ask them all (yes, including my Gengar) if any of them could possibly be useful in distracting a Pokemon I'm really looking for here, incase that I find one, and it turns out to be hostile towards other Pokemon. I'll also have Tyranno say hello to his Aerodactyl counterpart, while still keeping an eye out for any other Pokemon in the sky.