I found this lady in RSE, and she talks about how much your Pokemon like you, what are the phrases she says for the different ranges of friendship?
"It adores you. It can't possibly love you any more. I even feel happy seeing it." 255 friendship
"It seems to be very happy. It obviously likes you a whole lot." 200-254 friendship
"It likes you quite a lot. It seems to want to be babied a little." 150-199 friendship
"It's getting used to you. It seems to believe in you." 100-149 friendship
"It's not very used to you yet. It neither loves nor hates you." 50-99 friendship
"It's very wary. It has scary viciousness in its eyes. It doesn't like you much at all." 1-49 friendship
"This is a little hard for me to say… Your Pokémon simply detests you. Doesn't that make you uncomfortable? 0 friendship
"It clearly likes you very much. A Pokémon that adoring and adorable deserves a TM like this, no?" 151-255 friendship
"Hmm… It's not bad, but it's also not good. You, as the Trainer, need to put in some more effort." 100-150 friendship
"It has a vicious look to it. A frightening Pokémon like that deserves a TM like this." 0-99 friendship
I hope I've helped!