Abstract: I discuss new strategies to hunt for a resonance in diphoton final state. First, I present a new bound on diphoton resonances using inclusive diphoton cross section measurements at the LHC (ATLAS and CMS), in the so-far poorly constrained mass range between the Υ and the SM Higgs. This bound sets the current best limit on axion-like particles that couple to gluons and photons, for masses between 10 and 65 GeV. Also, we estimated indicative sensitivities of a dedicated diphoton LHC search in the same mass region, at 7, 8 and 14 TeV. For a lighter resonance below 10GeV, as preliminary studies, I discuss future searches for the resonance at the LHCb detector and Kaon factories such as KOTO and NA62.