So I just got Undertale, but I've known pretty much everything about it for three or more months. What I don't know is all of the endings for neutral routes. I first started with a couple of pacifist runs, but now I've grown a love for neutral. I first spared everyone but the bosses, which meant I had to kill Flowey. But since he's my favorite character, I didn't. In the end, Flowey asked me if I could prove to him that I could make it through a run without killing anyone to get a better ending. I wasn't done with neutral routes though. So naturally, I reset the game. When I saw Flowey again in his little spot where you first meet him, he said something like "Hey. Remember what I said? Don't kill anyone." Then he popped into the ground and Toriel came.
I did as he said and made it through most of the game without killing anyone. But when it came to Asgore, I decided not to spare him, just to test it out. As a result, Flowey got a bit angry. He said something similar to "You made all of these friends, just to kill ASGORE? What the hell is wrong with you?" and "Are you trolling me? You're only trolling yourself." When I reset the game, Flowey wasn't there at the beginning.
Once again, I decided to do a neutral route. But this time, I kill everyone EXCEPT the bosses. So that's what I did. After I spared Toriel, I was thinking of seeing Flowey again, have him scold at me a bit, and reset. But he didn't appear after that either. And like the previous run, I wasn't able to fight Omega because Flowey knew what would happen. So I hurried through the credits, skipped through Sans's call (which I didn't read because I skipped through so fast, but I know he said something different that time), and got to Flowey. He said "Why do you keep coming here? Oh wait, I get it. You want to be friends, don't you? You're PATHETIC." He then talks about how he could get along with someone like himself.
I reset the game again, but I haven't done anything yet. I made it to Flowey's spot, but once again, he's not there. I wonder if he's pushing me towards a genocide route, which was my original plan until now, or should I continue to go through neutrals just to see was he says. Maybe, he might give up. I'm not sure. But if there's one thing I'm sure about, it's that I am not giving up. So back to the question, can you possibly make Flowey like you, without going through a genocide route? I don't think I should go through genocide yet for two reasons. One, because then Flowey's memory will be reset when I give my soul to Chara, and two, because I don't want to see Flowey die.