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SOLO GUIDE FOR CHARIZARD if you don't want to deal with randoms or wait for invite codes on the thread. I have soloed every zard raid with no losses due to this strat.
Pre-raid: Make sure that you have the Sylveon build as seen in pic related. Natures, EVS, Moveset, Cloak, all of it.
Step 1: 3X Fake Tears as soon as Zard purges debuffs at start of raid (he will not purge any debuffs after)
Step 2: Draining Kiss to regain health, continue to use until shield appears.
Step 3: When shield appears, zard will use stat and ability nullify, which is when you use X2 Calm Minds.
Step 4: Draining Kiss until you can Terra
Step 5: You have won. Draining kiss/Hyper Beam it when low.
OTHER STRAT
Step 1: X3 Fake Tears after purge debuff
Step 2: X3 Calm Mind before shield appears
Step 3: Hyper Beam for OHKO
This one is a bit dependent on NPC mons not chipping away at zard's health to engage the shield, but is possible and potentially faster.