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I assume orange three star means that Pokémon is not having perfect full IVs.
Considering the current event, only viable good Pokémon worth considering in this event are : Charizard, Kartana, Golisopod. Others are not good, including Celesteela, as I will prefer bad 1*-2* IVs for Celesteela.
As Sheep said, the choice of Pokémon will play important role in deciding.
In that case, if you are targeting for Great League, then it can go till 1479 CP, whereas for Ultra League, it is the best possible option, but need to power up till level 51, which includes best buddy. And CP will be 2418. But here you need 298 candies and 296 XL candies.
Are there any other good Pokémon you caught recently ?
Edit: whichever Pokémon which I mentioned in the reply prior to this has list of good Pokémon in this sizable surprises event.