When does the guy blocking SunnyShore City move and what type of Pokemon..

Have you finished with the Team Galactic Veilstone HQ, and the Spear Pillar? Volkner uses Electric Type Pokemon, although he has only two Electric Types out of four Pokemon, Raichu and Luxray. His other two are Ambipom and Octillery, to counter Ground Type Pokemon you may be using.

Have you finished with the Team Galactic Veilstone HQ, and the Spear Pillar? Volkner uses Electric Type Pokemon, although he has only two Electric Types out of four Pokemon, Raichu and Luxray. His other two are Ambipom and Octillery, to counter Ground Type Pokemon you may be using.

He moves after you beat Team Galactic and beat/catch Dialga/Palkia.

The leader, Volkner, uses the ff pokemon:

Raichu
Ambipom
Octillery
Luxray

His gym trainers have electric-type pokemon. He is also an electric-type master.

After you capture/defeat Dialga or Palkia, the power has been restored to Sunyshore City, and he moves to let you past.
The Gym Leader Volkner Uses Electric Type Pokemon, but be warned, he only actually has two Electric Type Pokemon on his team of four, a Luxray, which is an Electric Type more known for physical attack power than special, but does have the standard Electric Type low physical defence, and does Not have the ability static as a choice of abilities. And Raichu, a familiar Pokemon, high special attack, and the ability Static. His other Pokemon are Octillery and Ambipom, odd choices for an electric type gym leader huh? All have the move Charge Beam on their movesets, that however being apparent as that is the move inside the TM given to you after you defeat him, so just expect it, and remember that it's base attack power is fairly low, only 50, but it has a high chance of raising the pokemon's special attack stat.

You must first crush Team Galactic in Mt. Corenet and at Spear Pillar after you have 7 badges and chase them out of their base. Once you do that, the Guy will move. The Gym Leader uses Electric Pokemon but throws in an Octillery and a Aibipom for diversity.