Talk:Twinkle Gem/@comment-26148878-20150615155946/@comment-26140304-20150729215928

The effects do indeed stack, but additively. Since we're talking about Elimo, here's how to reduce her BB and SBB costs to 1 BC: With the above, Elimo's BB/SBB costs will reduce by 95% (which is also quoting from what the anon said).
 * Double Supreme Ruler's Magic Leader Skills active (e.g. Kuda, Zellha, Phee, Lucana, etc.)
 * Elder Hat
 * Elimo's Extra Skill

Elimo's BB/SBB (20 BC) - 95% cost = 1 BC