i know there's a plushie that you use to get 20 pets...(i know its mega expensive, but once i'll get the last achievement for the shop till -like in 100years from now, lol, i'll get it)
i forgot its name, so please remind me?
Mystical Montre Plushie : 1 extra pet slot Mystical Donadak Plushie : 2 extra pet slots

Mystical Montre gives you one slot, mystical donadak gives you two.

so does it mean with the montre one i can have 11 or 15 pets? and the other 12 or 20? kinda confused in what "pet slot" means..
If you use the Montre plushie, you can get 11 pets. If you use the Donadak plushie, you'll get two extra pets. For a total of 12. The Montre plushie is cheaper and therefor only gets you one more extra pet spot.

Each pet slot = one pet. So to go from ten pets to 20 pets you need either ten Mystical Montre Plushies or five Mystical Donadak Plushies.
(five Donadak plushies will probably cost less than Montre ones in the long run if you buy them with sP, by the way).
It means if you have 10 pets, and you use a Mystical Montre, you'll have 11 pet slots total. If you used a Mystical Donadak instead, you'll have 12 pet slots.
EDIT: Darn my slowness!

thank you guys. guess what the only people/person that have them in the trades havent been on for more than 1 month. lol guess i'll have to wait more than a millenia, lol :D XD