It depends on how much time I have, though I do try to click back. Thank you if you do click.
1. Get more shinies.
3. Get Legendaries and Novelties I don't have.
4. Breed rare and/or green Pokemon.
Illumise, Aerodactyl, Gligar, Metagross, Moltres, Rhyhorn, Bagon
Moltres, Suicune, Lugia, Ho-oh, Regirock, Regice, Registeel, Latias, Kyogre, Groudon, Rayquaza, Jirachi, Deoxys, Dialga, Giratina, Cresselia, Manaphy
Zergoose, Bulbasaur Clone, Easter Buneary, Slime Slugma, Remorage, MissingNo, Shadow Lugia, Dracowymsy, Charmander Clone, Crystal Onix, Winter Vulpix, Primal Dialga, Bidofo, Shellderboy
Fossils: Aerodactyl, Lileep, Anorith, Shieldon, Cranidos, Relicanth, Omanyte, Kabutops
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I do not really use it much. Those I add I have generally had some interactions with them beyond clicking-and-clicking-back.
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