+
Soft-Boiled and Natural Cure: Audino seems really useful, but now with
reliable recovery and a
useful abitily it can be a really useful threat in the meta of RarelyUsed. Unfortunately, Audino-Mega just seems harder to use against some top threats.
It can't OHKO Tyrantrum and get 2HKOed by Scarf set with Head Smash, but can 2HKO it with an uninvested Dazzling Gleam.
About Mega Steelix, well, only can 2HKO if with Fire Blast Max SpA and Soft-Boiled doesn't work to avoid a 2HKO.
And Virizion, a Max SpA Dazzling Gleam Audino deals max 41% in +1 SpD Virizion, Virizion Calm Mind can 2HKO it with Giga Drain (98.4%) if +2 or OHKO it if with Focus Blast if +3 (87.5%)
But anyway, seems better than somethings
+
Tail Glow: Doesn't seems so good, its Speed Tie don't look really good, but it really trouble it : Simipour is faster and have a higher SpA, a +2 SpA Simipour LO is stronger than a +3 Phione. Be outspeeded by Virizion and Delphox isn't good, but be outspeeded by Venusaur and Rotom-C seems worse.
+2 252 SpA Life Orb Simipour Ice Beam vs. 0 HP / 0 SpD Virizion: 338-398 (104.6 - 123.2%) -- guaranteed OHKO
+3 252 SpA Phione Ice Beam vs. 0 HP / 0 SpD Virizion: 284-336 (87.9 - 104%) -- 25% chance to OHKO
Phione is bulkier, but almost never it is really useful to avoid OHKO/2HKO in both sides Physically and Defensively with super effective hits
252+ SpA Eelektross Volt Switch vs. 0 HP / 0 SpD Phione: 260-308 (86.3 - 102.3%) -- 12.5% chance to OHKO
0 SpA Amoonguss Giga Drain vs. 0 HP / 0 SpD Phione: 170-204 (56.4 - 67.7%) -- guaranteed 2HKO
0 SpA Amoonguss Giga Drain vs. 4 HP / 0 SpD Simipour: 206-246 (70.5 - 84.2%) -- guaranteed 2HKO
Is a really interessting competition, but the problem is : Simipour isn't ever viable in RU with a good speed tier, Nasty Plot, interessting coverage and good SpA, probably due to Floatzel's competition, I don't know what could do Phione really good, couting its not so bad bulky against many bulky Water-types in the tier (Blastoise, Jellicent) and, beside its ability to sweep against Floatzel and Simipour, it ability to deal many damage being slower, usually is worse than Slowking, who can avoid a Life Orb Jolteon / Manectric's Thunderbolt with full HP (and thanks to Regenerator) and OHKO them with Psyshock. Seems an option, but not so good like Manaphy is in OU, so I don't know...