Expression for text animation part.2

Hi,

I'm making a video with a character and a speech bubble, the text is animate with a typewritting effect, I was the one asking for an expression to always stop the animation 2 second before the end of the sentence but I didn't take my main adobe account.

Anyway, the bubble have a delimitation so the text boxe fit inside the speech bubble some sentence fit inside and some are so long that we cant see all the sentence.

When i put an auto-scrolling effect the text animation go out of the speech bubble.

I'm looking for an expression that can scroll up the top text ligne to make appear the next ligne on the buttom.

My english is pretty bad but the best example is show in this video of pokemon emerald, when the professor talk and explain the game Pokemon Emerald: Game Intro + Prof Birch Intro To Pokemon - YouTube at 1:52 its exactly the type of animation I'm looking for.

Thank you!