Minecraft: Pixelmon se me Crashea.

Al momento de iniciar la version de minecraft con el forge se me queda en la parte donde forge carga pixelmon, al iniciar minecraft solo con forge me va bien pero al poner pixelmon en la carpeta de mods crashea al cargarlo.
La version de pixelmon es la 4.2.5 y es para la 1.8.9 al igual que forge.

Esto es lo que me aparece.

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 03/06/16 19:47
Description: Initializing game

SplashProgress has detected a error loading Minecraft.
This can sometimes be caused by bad video drivers.
We have automatically disabeled the new Splash Screen in config/splash.properties.
Try reloading minecraft before reporting any errors.
net.minecraftforge.fml.client.SplashProgress$5: java.lang.IllegalStateException: Splash thread
	at net.minecraftforge.fml.client.SplashProgress.disableSplash(SplashProgress.java:591)
	at net.minecraftforge.fml.client.SplashProgress.finish(SplashProgress.java:583)
	at net.minecraftforge.fml.client.FMLClientHandler.haltGame(FMLClientHandler.java:292)
	at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:321)
	at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:495)
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:329)
	at net.minecraft.client.main.Main.main(SourceFile:124)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.IllegalStateException: Splash thread
	at net.minecraftforge.fml.client.SplashProgress.checkThreadState(SplashProgress.java:516)
	at net.minecraftforge.fml.client.SplashProgress.finish(SplashProgress.java:571)
	... 11 more
Caused by: java.lang.OutOfMemoryError: Java heap space
	at java.util.Arrays.copyOf(Arrays.java:3332)
	at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:137)
	at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:121)
	at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:421)
	at java.lang.StringBuilder.append(StringBuilder.java:136)
	at net.minecraftforge.fml.client.SplashProgress$3.drawBar(SplashProgress.java:414)
	at net.minecraftforge.fml.client.SplashProgress$3.run(SplashProgress.java:336)
	at java.lang.Thread.run(Thread.java:745)


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

-- Head --
Stacktrace:
	at net.minecraftforge.fml.client.SplashProgress.disableSplash(SplashProgress.java:591)
	at net.minecraftforge.fml.client.SplashProgress.finish(SplashProgress.java:583)
	at net.minecraftforge.fml.client.FMLClientHandler.haltGame(FMLClientHandler.java:292)
	at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:321)
	at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:495)

-- Initialization --
Details:
Stacktrace:
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:329)
	at net.minecraft.client.main.Main.main(SourceFile:124)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
	Minecraft Version: 1.8.9
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 1170232 bytes (1 MB) / 523501568 bytes (499 MB) up to 523501568 bytes (499 MB)
	JVM Flags: 7 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M -Xmx512M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	FML: MCP 9.19 Powered by Forge 11.15.1.1722 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{9.19} [Minecraft Coder Pack] (minecraft.jar) 
	UCHI	FML{8.0.99.99} [Forge Mod Loader] (forge-1.8.9-11.15.1.1722.jar) 
	UCHI	Forge{11.15.1.1722} [Minecraft Forge] (forge-1.8.9-11.15.1.1722.jar) 
	UCHE	pixelmon{4.2.5} [Pixelmon] (Pixelmon-1.8.9-4.2.5-universal.jar) 
	Loaded coremods (and transformers): 
	GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.4.0' Renderer: 'GeForce GTX 750 Ti/PCIe/SSE2'
	Launched Version: 1.8.9-forge1.8.9-11.15.1.1722
	LWJGL: 2.9.4
	OpenGL: GeForce GTX 750 Ti/PCIe/SSE2 GL version 4.4.0, NVIDIA Corporation
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: No
	Is Modded: Definitely; Client brand changed to 'fml,forge'
	Type: Client (map_client.txt)
	Resource Packs: 
	Current Language: Español (Argentina)
	Profiler Position: N/A (disabled)
	CPU: 4x Intel(R) Core(TM) i5-4460 CPU @ 3.20GHz