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I don't know how to fix it. I have pixelmon and optifine only in my mods folder, but pixelmon is causing it to crash. Here is my full crash-log:

---- Minecraft Crash Report ----

WARNING: coremods are present:
Contact their authors BEFORE contacting forge

// Who set us up the TNT?

Time: 8/12/16 4:22 PM
Description: Initializing game

java.lang.OutOfMemoryError: Java heap space
at java.util.BitSet.initWords(BitSet.java:166)
at java.util.BitSet.<init>(BitSet.java:161)
at net.minecraftforge.fml.common.registry.FMLControlledNamespacedRegistry.<init>(FMLControlledNamespacedRegistry.java:100)
at net.minecraftforge.fml.common.registry.FMLControlledNamespacedRegistry.makeShallowCopy(FMLControlledNamespacedRegistry.java:680)
at net.minecraftforge.fml.common.registry.PersistentRegistryManager$PersistentRegistry.getOrShallowCopyRegistry(PersistentRegistryManager.java:90)
at net.minecraftforge.fml.common.registry.PersistentRegistryManager$PersistentRegistry.access$500(PersistentRegistryManager.java:67)
at net.minecraftforge.fml.common.registry.PersistentRegistryManager.loadRegistry(PersistentRegistryManager.java:378)
at net.minecraftforge.fml.common.registry.PersistentRegistryManager.freezeData(PersistentRegistryManager.java:466)
at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:797)
at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:322)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:520)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:351)
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:498)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

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

-- Head --
Thread: Client thread
Stacktrace:
at java.util.BitSet.initWords(BitSet.java:166)
at java.util.BitSet.<init>(BitSet.java:161)
at net.minecraftforge.fml.common.registry.FMLControlledNamespacedRegistry.<init>(FMLControlledNamespacedRegistry.java:100)
at net.minecraftforge.fml.common.registry.FMLControlledNamespacedRegistry.makeShallowCopy(FMLControlledNamespacedRegistry.java:680)
at net.minecraftforge.fml.common.registry.PersistentRegistryManager$PersistentRegistry.getOrShallowCopyRegistry(PersistentRegistryManager.java:90)
at net.minecraftforge.fml.common.registry.PersistentRegistryManager$PersistentRegistry.access$500(PersistentRegistryManager.java:67)
at net.minecraftforge.fml.common.registry.PersistentRegistryManager.loadRegistry(PersistentRegistryManager.java:378)
at net.minecraftforge.fml.common.registry.PersistentRegistryManager.freezeData(PersistentRegistryManager.java:466)
at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:797)
at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:322)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:520)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:351)
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:498)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.10.2
Operating System: Mac OS X (x86_64) version 10.11.5
Java Version: 1.8.0_92, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 7490264 bytes (7 MB) / 1060372480 bytes (1011 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 5 total; -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.32 Powered by Forge 12.18.1.2050 Optifine OptiFine_1.10.2_HD_U_C2 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
UCHIJA mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
UCHIJA FML{8.0.99.99} [Forge Mod Loader] (forge-1.10.2-12.18.1.2050.jar)
UCHIJA Forge{12.18.1.2050} [Minecraft Forge] (forge-1.10.2-12.18.1.2050.jar)
UCHIJA pixelmon{5.0.0-beta5} [Pixelmon] (Pixelmon-1.10.2-5.0.0-beta5-universal.jar)
Loaded coremods (and transformers):
Launched Version: 1.10.2-forge1.10.2-12.18.1.2050
LWJGL: 2.9.2
OpenGL: NVIDIA GeForce GT 330M OpenGL Engine GL version 2.1 NVIDIA-10.0.48 310.90.10.05b12, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object 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: Yes
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Core(TM) i7 CPU M 640 @ 2.80GHz
OptiFine Version: OptiFine_1.10.2_HD_U_C2
Render Distance Chunks: 8
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: null
OpenGlVersion: 2.1 NVIDIA-10.0.48 310.90.10.05b12
OpenGlRenderer: NVIDIA GeForce GT 330M OpenGL Engine
OpenGlVendor: NVIDIA Corporation
CpuCount: 4