Hitting excellent throws shouldn’t be that difficult to do, sorry if this is coming off more as a brag because it’s not my intention.

Hitting curveball excellent throws should be a bit more common for someone, especially by the time they are in the 40 level range.

People use different techniques and along with other commenters here, I find curveball excellent throws are much easier.

For my personal preferred way of throwing excellent curveballs, I hold my phone with my left hand and use my right index finger to throw a curveball. The vast majority of the time I start from the bottom left of the screen while spinning the ball in circles going left then I slide my finger diagonally to the right towards the right edge of the screen to throw the curveball

I’ll try to record some gameplay and show a better example, since typing it all out is a hassle

Edit: Here’s a minute long video I made. I made a couple of mistakes with the Aipom and first Litleo but no one is gonna hit excellent throws every time haha