I've never really played with what the best strategy would be, but from my experience and the changes to the game since the last time I did one, this is how I would probably set it up.
By solo... I assume you mean with at least 2 accounts

2 Tamers with Greater Dragons (I'd Stress High Resists over anything else in this fight)
1 - SW Mage Tamer
1 - Disco/Peace Tamer ( Taming, Lore, Magery, Disco, Music, Provo, Med) -- Serious Skill Investment from Gear. MR Very Important
Obviously NO evil characters.
I'd start by Casting your Damage Reduction Buff. Picture Your Greater Dragon Riding an Armored Swampy. Then, get both Greaters on the champ and get it discorded. At this point, you can pretty much just stick to the SW Mage Tamer and just keep your ALT nearby. Your main focus during the fight is to keep his minions your top priority. It only takes a few before the area damage starts to wear your dragons down pretty fast on top of the regular hits. Once he gets low enough, WOD FTW. Swap to your Luck suit right before he dies and BAM, Phat Loot.
IF You Also manage to fit FOCUS onto your Backup Mage. (Lowering magery/taming/lore to minimum values, rocking a mark of the travesty, and a kickass mage book with magery and med). You might be able to run both Buffs, which would grant your main character an extra 9 Mana regen and your pets an extra 9 MR/SR/HPR, keeping them alive and pumping more damage. Honestly I don't think people realize the advantages these buffs have in pvm.......
If you don't have two accounts, but can afford an extra 12-13$ a month, I'd highly suggest investing in another one.