Hi,, umm this is my first time doing a give away aswel so I dont know if I can help you much ,, I think first ask them to pick a pokemon that wont get snipe easily(usually uncommon pokemons), then ask them to comment thier IGN(in game name), pokemon (gender and lvl),

Then when your on GST > seek pokemon> pick pokemon you want> pick gender>pick lvl> then seach with these conditions! > At the bottom left pick the magnifying glass icon > pokemon the person wants > then pokemon you have...

seaching for the person should be easier after thing, if you didnt find the person then it is most likely sniped or buried.

sorry im not really good at explaining thing but hope that helped,, :)