DaemonUmbra

Ok... let it go through the motions, don't touch anything. When it closes send me the debug.log from the logs folder of the server.

Whatever the hell BigChungus is (yes I know it's a meme), remove it and tell whoever claims to be it's developer to stop trying to take shortcuts and actually learn to make a mod.

The launcher calls them installations now, but they used to be called profiles, they’re the things that you select before you click play, they let you select the game directory(where the mods, logs, saves, etc folders go), the Java version used (by selecting the installation location of the desired Java version), and the desired Minecraft version(which Forge installs itself as)

You can change the Java version that the launcher uses through the Installation that you use

Please read the Logs section of my signature below and provide the appropriate log in the appropriate manner.

I'm guessing you are looking at the list that comes up when you click the profile name below and to the left of the play button, this is not the version list it is the Profile/Installation list. Make a new profile or edit an existing one to see the version list.

Use Java 8

So many hijackers. Make your own topics: If Forge installs but crashes, post a debug.log If the installer fails, post the installer log. If you can't find the Forge jar in the version folder, IT'S NOT MEANT TO BE THERE ANYWAY.

That's a server starting and running (mostly)happily. I don't see any issues here

While this is annoying it doesn't stop you using Forge. Forge installs itself as a version of Minecraft. Make a new Profile/Installation and select Forge from the version dropdown. (Note: For some reason Forge 1.12.2 gets booted to the bottom of the list.)

Let me guess... Happy: "Yay the issue is fixed!" Mad: "I spent HOW long trying to fix this and it was THAT simple?!"

Make sure you're using the version of Forge that Pixelmon is designed to run on

I would also recommend moving your server out of OneDrive

The filenames of one or more of your mods suggests you got them from a repost site. Please read up on the StopModReposts project (link in my signature) for info on why this is a bad thing.

Please read the Logs section of my signature below and provide the appropriate log in the appropriate manner.

Why are you using 1.12? If you don't want to use a 1.14 version at least use 1.12.2

It sounds like the first time the client install failed and you didn't know what went wrong. The second time sounds more like you selected "extract" instead of "install", this option will only produce the Forge jar and will not install Forge in a way that Minecraft will recognize. Make sure you select the client install option and if you still have an issue provide the installer log from that run.

Try with just Pixelmon, do you get the issue?

Ok then you appear to be refusing to help us help you so I suppose this issue can be counted as resolved.

Out of memory, give it more

Out of memory, give it more

Please read the Logs section of my signature below and provide the appropriate log in the appropriate manner.

It means Optifine's changes to base Minecraft don't conflict with Forge's changes to base Minecraft, but Optifine still doesn't have the entrypoint Forge is looking for.

This has nothing to do with ForgeGradle or even mod development, what made you think this was where you should post about this? Thread moved. It literally installs like any other mod.