Yeah, I'm still not sold. Scarf Porygon alone stops Double Rush singlehandedly (while Licki does nothing to stop Drilbur), while ckecking things like Misdreavus and Murkrow. Other attributes include Trace to soak up Chinchou's Volt Switch or whatever and Trick to screw up walls. I find what makes Porygon good is its ability to come out on top versus almost any non-Fighting threat due to its power, bulk and especially Recover, allowing it to outlast many foes in a neutral fight. Licki may boast more bulk, but usually needs the coverage to beat most bulky opponents due to his lackluster power, and not having instant recovery does not help it in this aspect. This severely limits Lickitung in options as a result: running Protect reduces coverage whereas not running Protect forces you to heal more often, and become deadweight if it is 2HKOed at say 50-60%. I also see you're underestimating the three move coverage Porygon can run with little consequence when Licki hesitates to do so, evidenced by the fact you say Tirtouga can setup on Porygon when the threat of Discharge exists.