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So.... I've tried installing Pixelmon 4.1.0 and it gets stuck at "Initializing Mods Phase 2" thing, and then takes ~5 mins before it crashes, and I've attempted to raise the RAM usage and such, still no luck. Anyways, here's the crash report

---- Minecraft Crash Report ----

WARNING: coremods are present:
Java8CheckerCoremod (Pixelmon-1.8-4.1.0-universal.jar)
Contact their authors BEFORE contacting forge

// I feel sad now

Time: 11/25/15 7:51 PM
Description: There was a severe problem during mod loading that has caused the game to fail

net.minecraftforge.fml.common.LoaderException: java.lang.OutOfMemoryError: Java heap space
at net.minecraftforge.fml.common.LoadController.transition(LoadController.java:163)
at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:733)
at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:316)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:492)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:325)
at net.minecraft.client.main.Main.main(SourceFile:120)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOfRange(Unknown Source)
at java.lang.String.<init>(Unknown Source)
at java.lang.String.substring(Unknown Source)
at java.lang.String.subSequence(Unknown Source)
at java.util.regex.Pattern.split(Unknown Source)
at java.util.regex.Pattern.split(Unknown Source)
at com.pixelmonmod.pixelmon.client.models.smd.SmdAnimation.startParsingAnimation(SmdAnimation.java:91)
at com.pixelmonmod.pixelmon.client.models.smd.SmdAnimation.loadSmdAnim(SmdAnimation.java:62)
at com.pixelmonmod.pixelmon.client.models.smd.SmdAnimation.<init>(SmdAnimation.java:30)
at com.pixelmonmod.pixelmon.client.models.smd.ValveStudioModel.loadQC(ValveStudioModel.java:92)
at com.pixelmonmod.pixelmon.client.models.smd.ValveStudioModel.<init>(ValveStudioModel.java:55)
at com.pixelmonmod.pixelmon.client.models.smd.ValveStudioModelLoader.loadModel(ValveStudioModelLoader.java:72)
at com.pixelmonmod.pixelmon.enums.EnumCustomModel.preloadModels(EnumCustomModel.java:270)
at com.pixelmonmod.pixelmon.client.ClientProxy.registerRenderers(ClientProxy.java:141)
at com.pixelmonmod.pixelmon.Pixelmon.init(Pixelmon.java:139)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:537)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:212)
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:190)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
Minecraft Version: 1.8
Operating System: Windows 8 (x86) version 6.2
Java Version: 1.8.0_66, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 899832 bytes (0 MB) / 523501568 bytes (499 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.10 FML v8.0.99.99 Minecraft Forge 11.14.3.1542 4 mods loaded, 4 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHI mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHI FML{8.0.99.99} [Forge Mod Loader] (forge-1.8-11.14.3.1542.jar)
UCHI Forge{11.14.3.1542} [Minecraft Forge] (forge-1.8-11.14.3.1542.jar)
UCHE pixelmon{4.1.0} [Pixelmon] (Pixelmon-1.8-4.1.0-universal.jar)
Loaded coremods (and transformers):
Java8CheckerCoremod (Pixelmon-1.8-4.1.0-universal.jar)

GL info: ' Vendor: 'Intel' Version: '4.0.0 - Build 9.17.10.2849' Renderer: 'Intel(R) HD Graphics 2500'

any help?

I just got it working, thank you guys for the help! ^-^