so I'm pretty decent Greninja main.

But I can't read for crap.

In one match, I'll roll at most like, 6 or 7 times, but yet my friends roll like 30 times per match. I know it's horrible to be rolling that many times, but I can't read and punish it, which frustrates me, Becuz I end up losing to a roller (scrub). I try to read sometimes, but they always end up rolling the way opposite that I predicted, and I end up being the one punished, HARD, since I can get Back Thrown and KO'ed by Ness, or f-smashed by Toon Link, Shulk, or MegaMan. On average, I can punish around 1 roll per match, 2 if I'm lucky. Can anyone help?

Some examples:

Sometimes I approach and predict them to roll back, so I run a little farther and grab, but they end up rolling forward, and sometimes vice versa.

Sometimes, I space around with Water Shuriken, which forces them to approach. They start rolling towards me, so I d-smash, but they end up rolling back right as they get near me, so I grab instead, but then they just keep rolling forward.