Stage Analysis from "Raidboss_garp wiki guide:

Note: it is necessary to reach stage 4/5 with HP under 30% but higher than 2.981 in order to stand a hit from Garp. This will be taken into consideration during the stage analysis. If you consider any other scenario please tell me and I will include it.

Stage 1/5: mobs hit for about 3K damage. I do not know their cd, so let’s consider the lowest cd possible: 1. Take one of the mobs + stall on the other. If you are luck the starting cd of the mobs can be up to 3 so you will be stalling 3-5 turns here.

Stage 2/5: start hitting the back corner right marine in order to leave the elder seahorse last. This guys have got high armor but we should get rid of all of them. Elder seahorse in the next turn. 2 turns stalled here.

Stage 3/5: when you arrive here you have to calculate the following: 30% HP > HP > 2.981 after this stage. In this stage you will receive the following damage: 2.550 pre-emptive attack + 550 * 9 = 6.950, so: Total HP - 6.950 + hits from stage one = 30% HP > HP > 2.981.

Example: say your team has 13.000 HP. Then, 13.000 - 6.950 = 6.050. 13.000 * 30% = 3.900. Therefore you should take 2 hits from stage 1. But, BE CAREFUL! You must calculate this before the battle, because if instead of 13K HP you’ve got 12K you will be only take 1 hit.

9 turns is the maximum you can stall. The turtle has HP = 29. You will need to use characters with combo 4. However, this stage is where you need to farm for INT orbs. Vista has combo 5, as well as helmeppo. This will only allow you to stall 5 turns and will change the maths above. Note: you have to watch

Stage 4/5: hit the marine in the first turn. (unless you have miscalculated your HP, then you can hit coby and the marine will hit for 1.104, but remember your HP must be be: 30% HP > HP > 2.981). Hit Coby in the second turn. 2 turns stalled.

Stage 5/5: First to consider is Coby’s and Robin’s cd. They should be = number of stalled turns. 13-19. You will attack first. Attack Garp with a perfect chain. He will attack you (you will have enough HP, above 2.980) and then you will finish him.