The most commons marks are
'850 Plat' or '850 Pt'
OR
'950 Plat' or '950 Pt'
Platinum
Go and talk to the owner of poketch in poketch company's building he will install the marking map app in your poketch
Platinum jewelry is typically marked with the numbers 950 or PLAT, indicating it is made of at least 95% pure platinum. Additionally, some platinum pieces may have a small hallmark symbol or stamp to indicate the metal's quality and authenticity.
Zapdos, moltres, and articuno are only roaming around in Platinum.
You have to go to Jublife City, into the Poketech building. Talk to the man in front of the counter, and he will give you the marking map.
You can find articuno in the poketch marking app when he's all around
App is not an item, it is those things that you put into youir poketch, such as the marking map.
go to verity lake talk to mesprit and it will disappear then professor rowan will come up and give it to you.
of course you can if you go to the poke etch creator he gives you various due to how many badges you have
you chase them down using your marking map on your poke-etch.you will see icons on the screen.
when trying to get the legendaries that you can see on the marking map keep walking in and out of the same town or city and the legendaries will eventually come to you!
This is to let you know that the metal you purchased is indeed Platinum. PLAT is an authentic marking for Platinum. The WIC most likely represents the manufacturer.