diff --git a/Assets/gamedb/gamedb_nes.txt b/Assets/gamedb/gamedb_nes.txt
index 8a88ff01f8..d55f9d0b1d 100644
--- a/Assets/gamedb/gamedb_nes.txt
+++ b/Assets/gamedb/gamedb_nes.txt
@@ -306,6 +306,12 @@ sha1:17473C223453D2D80FCB9DCFA317947287DC5C52		Xing He Zhan Shi (China) (Unl)	NE
 sha1:B1C74236FD17FAB4AB9AA6AB28E38864C66D6255		Pocahontus (UNL)	NES		board=MAPPER182;PRG=256;CHR=256;WRAM=8;PAD_H=1
 sha1:5FA23F88432006DCF6874EA36E9E7DA8934427BE		Super Donkey Kong (Unl)	NES		board=MAPPER182;PRG=128;CHR=128;WRAM=8;PAD_H=1
 sha1:8A7DAB8B78DA1C5EA159BA9EEC00FF97742245F1	B	Super Donkey Kong (Unl) [b1]	NES		board=MAPPER182;PRG=128;CHR=128;WRAM=8;PAD_H=1
+sha1:CA7F528C5AD73596961CFCE30194592FDBCF4505		Pokemon Platinum Alt title 2 (KT-008 PCB)(Ch)[!].nes	NES		board=MMC3_Pokemon
+sha1:6668AF3F57BB776629AB512E87C202614ABF41CA		Pokemon Platinum Alt title 1 (KT-008 PCB)(Ch)[!].nes	NES		board=MMC3_Pokemon
+sha1:5010EA0CD5E94B9E2F13A9C1E03AF66FFBD09832		Pokemon Platinum (KT-008 PCB)(Ch)[!].nes	NES		board=MMC3_Pokemon
+sha1:B11D65F508AD5E72274F049F6DDAEFC6188250FC		Pokemon HeartGold (KT-008 PCB)(Ch)[!].nes	NES		board=MMC3_Pokemon
+sha1:EB97C94DDA0EC647418B05C4E2CAB61CA0AF0380		Kou Dai Guai Shou - Fei Cui Ban (C) [KT-1063].nes	NES		board=MMC3_Pokemon
+sha1:82323E1CD27EC434843AA1B44E3D89A09860F430		White Jade Version (China) (Unl) [CHS](0834).nes	NES		board=MMC3_Pokemon
 
 ;wrong vram info
 sha1:32D71DD6C5A8D78A918FE1B9D6D6C4A570D9652D		Oeka Kids Anpanman no Hiragana Daisuki (J)	NES		board=MAPPER096;VRAM=32
diff --git a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/MMC3_Pokemon.cs b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/MMC3_Pokemon.cs
new file mode 100644
index 0000000000..56431d0c28
--- /dev/null
+++ b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/MMC3_Pokemon.cs
@@ -0,0 +1,51 @@
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	internal sealed class MMC_Pokemon : MMC3Board_Base
+	{
+		// unsure if this is represented in any other mapper (it doesn't appear to be.)
+		// the games have a register at 0x5000 that swaps out 512K banks that the MMC3 references.
+		// unclear if it is readable or has mirrors etc
+
+		public byte prg_reg;
+		
+		public override bool Configure(EDetectionOrigin origin)
+		{
+			//analyze board type
+			switch (Cart.BoardType)
+			{
+				case "MMC3_Pokemon":
+					break;
+
+				default:
+					return false;
+			}
+
+			prg_reg = 0;
+			BaseSetup();
+
+			return true;
+		}
+
+		protected override int Get_PRGBank_8K(int addr)
+		{
+			int bank_8k = addr >> 13;
+			bank_8k = mmc3.prg_regs_8k[bank_8k];
+			bank_8k |= prg_reg;
+			return bank_8k;
+		}
+
+		public override void WriteExp(int addr, byte value)
+		{
+			if (addr == 0x1000) { prg_reg = (byte)(value != 0 ? 0x40 : 0); }
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			ser.Sync(nameof(prg_reg), ref prg_reg);
+			
+			base.SyncState(ser);
+		}
+	}
+}
\ No newline at end of file