Robin's Counter Picks

Charging Thunder all the way isn't always the smartest choice, Elthunder is a solid alternative.

Use tilt attack or a regular attack in ground, aerials will use bronze Use smash attacks in ground, aerials will use levin Pressing A+B in the air (With A+B setting on) he'll use Nair levin

Elwind can be used to disrupt low recoveries safely.

If you want to stop a quick opponent, use uncharged Thunder! It's as fast as Young Link's arrows and uses the least of Robin's tome. Also can be used for combos in the air.

Using arcfire too much in neutral can lead to you getting hard punished due to its long FAF. Be patient with its use, especially considering how it has limited uses per tome.