Updated Infinitely reusable TMs (markdown)

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+Credit to paccy for this tutorial in the Simple Modifications Pokecommunity thread.
+
+This tutorial will make all TMs infinitely reusable, unholdable by Pokemon, unsellable to shops, and also removes the number from appearing in the Bag.
+
+## Contents
+1. [Don't consume TMs on use](#1-dont-consumes-tms-on-use)
+2. [Treat TMs as HMs in the bag](#2-treat-tms-as-hms-in-the-bag)
+
+## 1. Don't consume TMs on use
+Normally, the game checks if the item used was a TM or an HM, and consumes the item if it was a TM. We can just simply remove this check.
+
+Edit [src/party_menu.c](../blob/master/src/party_menu.c): 
+```diff
+static void Task_LearnedMove(u8 taskId)
+{
+    struct Pokemon *mon = &gPlayerParty[gPartyMenu.slotId];
+    s16 *move = &gPartyMenu.data1;
+    u16 item = gSpecialVar_ItemId;
+
+    if (move[1] == 0)
+    {
+        AdjustFriendship(mon, FRIENDSHIP_EVENT_LEARN_TMHM);
+-       if (item < ITEM_HM01_CUT)
+-           RemoveBagItem(item, 1);
+    }
+    GetMonNickname(mon, gStringVar1);
+    StringCopy(gStringVar2, gMoveNames[move[0]]);
+    StringExpandPlaceholders(gStringVar4, gText_PkmnLearnedMove3);
+    DisplayPartyMenuMessage(gStringVar4, TRUE);
+    schedule_bg_copy_tilemap_to_vram(2);
+    gTasks[taskId].func = Task_DoLearnedMoveFanfareAfterText;
+}
+```
+If you were to stop here, TMs can still be given to Pokemon and you can still see the number in the bag. The next step will address this.
+## 2. Treat TMs as HMs in the bag
+`struct Item` has a field `importance`. If this field has a nonzero value, then the item is treated like a key item, and cannot be held, tossed, or deposited in the PC, and it will not display an item count in the bag. Furthermore, items with a price of 0 cannot be sold.
+
+Edit [src/data/items.h](../blob/master/src/data/items.h):
+```diff
+    [ITEM_TM01_FOCUS_PUNCH] =
+    {
+        .name = _("TM01"),
+        .itemId = ITEM_TM01_FOCUS_PUNCH,
+-       .price = 3000,
++       .price = 0,
+        .description = sTM01Desc,
++       .importance = 1,
+        .pocket = POCKET_TM_HM,
+        .type = 1,
+        .fieldUseFunc = ItemUseOutOfBattle_TMHM,
+        .secondaryId = 0,
+    },
+```
+You will need to repeat the above for every TM.
+
+And that's it!
+
+![](https://i.imgur.com/KwzzUSm.png)
+
+Notes: Pokemon will replenish their PP if a TM move is forgotten and relearned.
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