*taken from Bulbapedia*
If the Pokémon with this ability is leading the party, Synchronize increases the rate of encountering a wild Pokémon with the same nature.
So in other words, no. The synchronize ability also passes on status problems to the enemy.
vulpix is not in Pokemon platinum version.
Yes creselia is is in Pokemon Platinum.
The ID For Pokemon Platinum(USA) CPUE d074d1b3
you can't
It is possible to get the Pokemon Gulpin in Pokemon Platinum version by going to the Great Marsh. Gulpin is a poison type of Pokemon.
vulpix is not in Pokemon platinum version.
Yes creselia is is in Pokemon Platinum.
No
no, these Pokemon are unknown in Pokemon platinum
The ID For Pokemon Platinum(USA) CPUE d074d1b3
no you can not.
yes but it is called Pokemon platinum
you can't
You can't, Mewtwo is not available in Platinum.
There is not a verstion of platinum for gba
No
no.