Calling for help, are you? There is no escape. Git Gut. Seriously, it's the only tip. You're gonna have to learn how to survive. There are six breaks in the fight where the game saves and where you get a chance to heal. Tap the arrow keys to dodge the eye pellets. I beat Flowey second or third try true story!!!
In the beginning you'll notice a "FIGHT" button that appears. The only real advice against Omega Flowey is basically to get good at dodging. I would recommend playing some bullethell games to practice twitch-dodging and then just brute-forcing against Omega Flowey to practice, but here's the thing about Omega Flowey... while I haven't fought him myself I've seen the fight, and I have never seen a bullethell boss with attacks that come out THAT rapidly. All other bullethell bosses give you at least some breather room between attacks. Practicing in other games won't really help unless you stumbled upon an Omega Flowey Danmakufu script or managed to find a replica of him in Fraxy, and I doubt either exist (though I may try making the latter just so that people have something to practice against).
So, with that said, your only option is to just keep at it. Now that the battle has begun, the first attack you are likely to see is the shuriken type bullet attack. This attack starts pretty quickly and can be a bit overwhelming. It consists of a barrage of projectile bullets firing from either the bottom set of eyes or the top. The set of bullets that fire from the top fire in a triple formation directly towards you from both eyes. The set of bullets that fire from the bottom are fired in a random spread surrounding the entire area making them more difficult to dodge unless you're quick. A good way to avoid getting hit by the top set of bullets is to get yourself to the bottom of the screen and try to move either left or right with the bullets slowly. There are two small spaces you can move in while the bullets fire. The lower set of bullets are slightly more difficult to dodge however. Their pattern is random and completely spread out. The best thing to do about the lower set is to stay at the bottom of the screen and be swift about your movements.
The vine attack is another commonly used quick attack. It starts by a large number of flashing lasers map out where the thorny vines are going to hit, almost full time always aiming at you. Following barely seconds after predicting where they're going to be shot, multiple vines shoot from the top of the screen trying to hit you. This can happen a total of two times in a row as long as the attack doesn't repeat. It's very easy to get cornered by this attack because of its speed. If you're ever trying to prepare for this attack, try to stay somewhere near the middle or a bit to the sides. The flamethrower attack is a slightly less difficult attack to dodge. It starts with a flamethrower appearing from the left side of the screen near the large cactus like appendage, firing from the bottom left of the screen to the right. Immediately after that a second flamethrower appears repeats the same pattern, but on the right side of the screen, and then again on the left. They will fire in this order - Left, Right, Left. The best way to avoid this attack is to move right to avoid the fire of the first one, and then left when the second one spawns, and then right once more. As with a couple other attacks, this attack can come out of nowhere when you least expect it.
This attack starts with 3 flashing circles spawning around you in a sequence. Similar to the vine attack, the circle that spawns is there to map out where the attack will happen. After the circle outlines spawn, seeds will line up and close in on the center of the target. The battle continues with chaotic patterns and the need to learn exact timings. The key is to stay calm, observe the patterns, and respond with precise dodges rather than panicking.
When the fight progresses, Flowey's form changes and the attack patterns become more intense as he cycles between an all-out assault and a short battle against one of the six Souls. Light blue soul: Dodge the whirling blades. Orange soul: Boxing gloves will circle around the screen, moving in and out as they do so. Dark blue soul: Stay as low as possible, and duck underneath the shoes as soon as you get the chance. Purple soul: Words will float in from either side of the screen, so just stay in the middle and just move up and down to dodge them. Green soul: Stay low and move from side to side to avoid the flames spewing forth from the frying pans. Yellow soul: Stay clear of the area between the gun and the target and you'll easily avoid taking damage.
Another notable part of the battle is the giant laser and the sequence of giant shoes and gloves. Dodging the giant gun is a lot easier if you ignore the gun itself and just avoid the crosshairs. Dodging the giant shoes is a lot easier if you keep moving left for the most part until they all rise, then you quickly move pretty far to the right. At the parts with the gloves & knives, you might think you need to hurry to reach the Act button but you actually have a lot of time to be cautious. When he loads save states, you can often dodge whatever's coming by just immediately moving in the opposite of the direction you were just moving in. The only advice I have for the giant laser is that you can see him charging it long before he fires it but it's hard to notice because of everything else you have to pay attention to. Touching him won't hurt you so you can fly right through him if you need to. I think a lot of the reason people have so much trouble beating him is because they panic.
Throughout the guide, you may read about experiences from others who encountered Flowey and Asgore, including sparing or killing, which can lead to varying post-battle content. Some players have noted extra content after sparing Flowey, while others report different endings depending on Pacifist or Genocide routes. The core mechanic remains dodging and learning attack patterns, then adapting to the evolving difficulty of the fight.
When you're facing Omega Flowey, remember: practice makes perfect, stay patient, and focus on precise dodges rather than rapid button mashing. The battle rewards persistence with clearer patterns and, eventually, a successful victory after learning to identify and counter each attack as it unfolds.
