That set isn't too awful. Gunk Shot actually gets great neutral coverage in Ubers believe it or not, so along with Ghost and Bug you can actually hit a lot of things quite hard. Techno Blast is quite obviously stupid (use Blaze Kick/Iron Head!), but I've had moderate success with a similar set.
It can actually 2HKO/OHKO a lot of cool stuff if it gets the attack boost and you predict correctly (obviously it OHKOs the Latis and Mewtwo and Darkrai too):
+1 252 Atk Life Orb Genesect Shadow Claw vs. 212 HP / 72 Def Giratina-O: 263-309 (53.23 - 62.55%) -- guaranteed 2HKO after Stealth Rock
+1 252 Atk Life Orb Genesect Gunk Shot vs. 248 HP / 0 Def Ho-Oh: 264-311 (63.61 - 74.93%) -- guaranteed 2HKO
+1 252 Atk Life Orb Genesect X-Scissor vs. 4 HP / 0 Def Kyogre: 265-312 (77.48 - 91.22%) -- guaranteed OHKO after Stealth Rock and Spikes
+1 252 Atk Life Orb Genesect Blaze Kick vs. 252 HP / 0 Def Ferrothorn in rain: 265-317 (75.28 - 90.05%) -- 56.25% chance to OHKO after Stealth Rock and Spikes
+1 252 Atk Life Orb Genesect Blaze Kick vs. 252 HP / 252+ Def Forretress in rain: 192-229 (54.23 - 64.68%) -- guaranteed 2HKO