Well, closest is probably Max Attack S. But nobody is crazy enough to do that. There are also the other maximum attack quests and phantasmal world quests which people actually do occasionally.
There is no Ra- merge, that was a thing another server made. We only have the regular vanilla merges and a couple extra shields with tech boosts. For those techs we have 3 seals for 25% ra techs, and hylian shield for 100% grants, 75% rafoie, 60% razonde (triforce event item). We also have Virus Shield: Vol Opt for 20% Gi- techs and +10 ata.
Material amounts are the same. Max stats are +100 atp, dfp, mst, +10 ata, +30 evp over vanilla. You can find max stat plans here http://www.phantasystaronline.net/forum/index.php/topic/21971-yanvbraz-max-stats-plan-thread/?p=118688