Shiny Pokemon

Every session rolls shiny once, at creation, with default odds 1-in-64 — independent of species, and kept for the session’s whole lifetime, through every evolution stage. Override for testing/demos with the POKE_SHINY_ODDS environment variable (1-in-N; 1 means always shiny), set on the process that launches Electron:

POKE_SHINY_ODDS=1 npm run dev

A shiny walker’s first garden spawn plays a sparkle burst (a ring of 4-6 twinkling white/gold stars) and a floating “✨ Shiny!”; a small ★ badge marks it on its session tab and, if that line is already taken, in the picker. Showdown/Smogon ship no shiny sheets for the 42 bundled species, so a shiny pick always fetches its sprite lazily — front and back, animated or static — even for an otherwise-bundled species; a 404’d shiny front sheet falls back to the normal sprite (logged), keeping the shiny flag and badge either way. Wild subagent-battle challengers (see Subagent battles) roll shiny with the same odds and get the same spawn sparkle.