To be honest, I think Tentacruel still has a perfectly valid niche. TSpikes are really effective in the current metagame and Acid Spray + Scald lets it set up the hazard on CM versions of Mega Sableye (not the Knock Off utility ones though), which is pretty impressive for a hazard setter. Tentacruel is also a great answer to threats like Gengar, non-SubCM Keldeo, Clefable, and Heatran while providing invaluable anti-hazard support. The moveset Hydro Pump / HP Fire / Acid Spray / Rapid Spin, which Inflikted used in SPL, is probably the best overall hazard remover in the tier in terms of matchups against SR users and relative difficulty in being exploited, though I think it's typically inferior to a more passive TSpikes + Scald set simply because TSpikes are so useful. That all depends on the team, but Tentacruel can prove itself an asset to balanced and stall teams in the metagame, even with Greninja banned.