Scales to Play Over G# major
Every chord is a subset of several scales: any scale that contains all of a chord's tones fits over it. Pick a chord to see the matching scales from its own root, the major keys the chord belongs to, and full fretboard diagrams for every scale on guitar.
A G# major chord contains the notes G# – B# – D#. Any scale that includes every one of those 3 tones fits over it — from the root G#, that means G# Major, G# Major Pentatonic, G# Rock 'n' Roll, G# Lydian, G# Mixolydian, G# Dorian Bebop, G# Mixolydian Bebop, G# Half Whole Diminished, G# Spanish and G# Gypsy Major. They differ only in the notes between the chord tones, and that is where each scale gets its color.
G# major is also diatonic to 3 major keys: Db major (relative minor Bbm), Eb major (relative minor Cm), Ab major (relative minor Fm). In a song from one of those keys you can also solo with the key's own major scale or its relative minor pentatonic across the whole progression, not just this chord.