Billy Martin

At 1:43 in the video, Billy goes into the reasoning of having his PRS torero out on the road with him; "On our new record Cardiology, the first single's called "like it's her birthday", and i played a guitar solo in which i used the floyd rose whammy on that, so, i needed a guitar so i could do that live, and Paul Reed Smith hooked me up with this torero.

Billy calls it a secret weapon. Uses it just for a tremolo effect.

In this video, we can see Billy playing his PRS SE Standard 22

In a video by Loudwire, Billy Martin of Good Charlotte plays his favorite riffs using a PRS CE 24 guitar.

Billy goes over his own rig in the video.

In a MusicRadar YouTube video, Billy Martin of Good Charlotte is shown using the MXR EVH90 EVH Phase 90 pedal as part of his live rig.

As seen in Billy's rig video.

Says he's used them for 10-12 years and grew up wanting to play Mesa.

Guitar.com interview with Martin done back in 2010:

I use a Dual Rectifier. I have one Dual Rectifier head through four Dual Rectifier cabinets. I also use two Bad Cat combos. Im not sure exactly which models the Bad Cats are, but theyre two different ones, and I use one for clean and one for dirty. They had sent them to me at the beginning of the tour and said I could check them out. I mix the one Bad Cat with the Mesa/Boogie for my heavy sound, and I use just one Bad Cat combo by itself for the clean sound.

"I have a lot of Boss stuff like the PH-2 Super Phaser, DD-5 Delay, and the RV-3 Reverb/Delay. I also have a Voodoo Lab Tremolo, Voodoo Lab Analog Chorus, Dunlop Crybaby wah wah pedal, Digitech Whammy pedal, and Digitech Overdrive."

At 0:30 you can see a pedal on the top row, far left that I assume is the SD-1. Going by the yellow of the pedal and the knobs

Billy shows this wah on his board in the linked video.

In a MusicRadar video, Billy Martin of Good Charlotte showcases his live rig, including the DigiTech Whammy Pitch-Shifting Pedal.

Billy shows this in the video.

Billy shows this on his board in the video.

In a MusicRadar video, Billy Martin discusses using the Boss DD-5 Digital Delay as part of his live rig.

Billy says he uses the standard 4x12. Likes the harder sound despite not making sense for the type of music.

"I have a lot of Boss stuff like the PH-2 Super Phaser, DD-5 Delay, and the RV-3 Reverb/Delay. I also have a Voodoo Lab Tremolo, Voodoo Lab Analog Chorus, Dunlop Crybaby wah wah pedal, Digitech Whammy pedal, and Digitech Overdrive."

"I have a lot of Boss stuff like the PH-2 Super Phaser, DD-5 Delay, and the RV-3 Reverb/Delay. I also have a Voodoo Lab Tremolo, Voodoo Lab Analog Chorus, Dunlop Crybaby wah wah pedal, Digitech Whammy pedal, and Digitech Overdrive."

"I have a lot of Boss stuff like the PH-2 Super Phaser, DD-5 Delay, and the RV-3 Reverb/Delay. I also have a Voodoo Lab Tremolo, Voodoo Lab Analog Chorus, Dunlop Crybaby wah wah pedal, Digitech Whammy pedal, and Digitech Overdrive."

"Sometimes I will, but lately weve been demoing songs for the new record and I have a little Digidesign Mbox and Pro Tools set up, and I've been locking myself into a room every day and just recording demos all day long."

At 0:30 you see billys pedal board which has the tu-2 tuner