In the wider games, Gyarados was used to show players what shiny Pokemon were, with a red shiny Gyarados being a minor plot point in Pokemon Silver, Gold and Crystal
Ranar generates its own tokens when you exile cards and the from hand part could hint at foretell doing something with exiling cards from your hand
When a Pokmon evolves, it keeps all cards attached to it (Energy cards, Evolution cards, etc.) and keeps any damage it already has, but it cant use the attacks and Abilities of the Pokmon from which it evolved
Wizards has a history of waiting too long or trying something else first (see Hogaak and Bridge from Below) and unfortunately, what they did is condemn us to at least a couple of months where Oko, Thief of Crowns is definitely the best thing to be doing in Standard
For some reason, these rares were reprinted in both Fifth and Sixth editions
Lifelink Only Works When Damage Is Actually Dealt In Magic , Lifelink only works if damage is actually dealt