If alot of you don't know what a Poke Seal is, it's when you can add things (Like stickers) to a Pokeball. Then when Pokeball is used(which has Pokemon inside, used during battle) whatever you have on it(Stickers or what not, can be text) the animation of it will ensue or the text will pop as the Pokemon is jumping out of it's ball! Say you put a lightning bolt sticker on your Pokeball, when you use that Pokemon (In battle), then when Thrown the Pokemon will burst out with lightning crackling behind it.
It was in Diamond/Pearl. Here's what the editing looks like (Only could find Japanese version):
[spoiler][img]http://www.serebii.net/diamondpearl/stickers2.png[/img][/spoiler]
[spoiler][img]http://www.serebii.net/diamondpearl/stickers.png[/img][/spoiler]
Personally watching a giant explosion of flame followed by a Charizard would be quite...well.. arousing to the eye!