Dragon Pulse is unnecessary... but if you transfer, you won't get Aura Sphere, which is arguably one of its more useful moves to hit the likes of Ferrothorn, Tyranitar, etc harder.
Meh, Ferrothorn isn't as great as he was before, with powerful threats like Talonflame, Mega Charizard {who cares which}, and other powerful 'mons carrying SE moves. Furthermore, spikes stacking isn't as useful due to nice spinners like Excadrill and le Mega Blastoise running around, as well as Defog, which is easy to fit on a lot of 'mons. He also lost two crucial resists to Dark and Ghost, and can no longer benefit from rain for days. He's not too important.
...Wow, that sounds weird to say. "Ferrothorn is not too important." Jesus.
Tyranitar, yeah, definitely, though a Scald burn is pretty cool. Max/Max AssVest TTar isn't even always 2HKOd by Max/Modest MegaBlastoise Aura Sphere lmao. Such bulk. Hydro Pump's always a 3HKO unless you miss or you're
very unlucky with damage rolls, and if you don't get a burn with Scald, it brings up the rear with ~4HKO.
Ice Beam's pretty nice for dem dragons, as well as any grass types dumb enough to switch in, though there honestly aren't many of those, either. Occasional freeze hax is pretty sweet, even if it makes you feel like an asshole.
It's also easier to get onto the Blastoise, particularly if you have Y, as you don't require El Guncrab to get it onto your 'toise. Though that means little for simulator play, it's cool for cartridge shenanigans.
OP needs to be updated to remove Megagar if at all possible, because he got smacked with the banhammer, thank the lawd. Here's hoping for MegaMom and MegaLuke, too, but that's a different topic.