I do wonder what the exclusive moves could be for the legendary beasts. Entei and Raikou already have the best movesets that are currently in the game for their type. Suicune, on the other hand, has a bad moveset, but it with that low attack stat it doesn’t have a chance compared to the other water attackers.
Since Niantic doesn’t seem too eager to introduce new movesets as of late and due to their current rule of not being able to TM what you caught before an event, I think it would be for the best if they give either coverage or PVP oriented moveset. This way a new move would be good for a certain niche, while those who powered up Entei and Raikou wouldn’t get screwed over.
For Raikou a candidate would be Discharge. It doesn’t learn any good coverage moves against ground and giving it something like Crunch would be an odd choice tbh.
For Entei candidates could be Solar beam for coverage(does hit all three weaknesses, but it’s not practical) and Flame Charge, which despite being weak would be good since it needs less energy comapred to the other moves.
For Suicune the most obvious thing would be to give it Waterfall, which I guess could make it better for PvP, where its defensive nature isn’t a hindrance, as well as better than all three fast moves it had till this point. That being said, why again are legendary pokemon not allowed for gyms? Cause this rule makes a lot of them ure dex fillers.