Is revival blessing the only way to revive a Pokemon in competitive battles in any core series game?

Question

Reviving Pokemon was impossible for a very long time, so the existence of revival blessing and possibly another reviving game mechanic seem pretty important. Please don't cite Bulbapedia's fainting page because other Bulbapedia users don't seem to do a very good job of updating it.

Answer 1

No it is not.

In Gen V, there was an obscure multiplayer feature called the Wonder Launcher, where if both players had it activated in the battle rules, could allow for the use of some specific items over the course of the battle. These items consist of all X items, Potions, Revives, Ethers, and other items that were Wonder Launcher exclusive.

A Revive costs 11 points to use and a Max Revive costs 14 points to use, which is the most of any item obtainable.

Source

As far as I know, this is the only time where such an occurrence is possible