There's no obvious way I can see to tell. What makes things worse for me is their IVStats Pro app (which I paid a nominal fee for) has different ratings from what appear here. The app is supposed to stay current and has updated new moveset ratings relative to many on this site, but some of these have been in turn superseded by newer moveset updates on this site. It's all very confusing.
GamePress
Gen 1 ratings update
So i noticed that some gen 1 pokemon ratings and moveset ratings have been updated, e.g. dragonite; and some have not, e.g. Jolteon. So is there a way to tell them apart? Some like vaporeon are hard to tell, since old move dynamics like water pulse were changed without retiring/introducing new moves.
Also huge thanks to the development team for all existing and historical work already done.