There can be arguments made for each movie.
End Game - Follow up to the 2 billion grosser Infinity War (which ended with a cliff hanger) people will want to see what happens next. If the movie is anywhere near decent 1,7-1,9 billion is LOCKED.
TLK - Disneys biggest classic. Beauty and The beast did 1,2 billion and Lion King is way bigger - so expect the gross to be at least 1,5 billion.
I don't think Pikachu will come close to these numbers. But I guess we shall see when the numbers finally come!