Port field moves from the menu, SEL with Select, and moving Pokémon in Bill's PC

Field moves chosen in the party menu run their original checks and the
ROM's from-menu scripts (Cut, Surf, Strength, Flash, Whirlpool, Waterfall,
Sweet Scent), and Softboiled and Milk Drink share HP. SEL registers a key
item that Select then uses, replacing the Key Items shortcut, and Bill's
PC moves Pokémon between the party and every box.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/pc.test.ts

@@ -226,6 +226,115 @@ describe.skipIf(!existsSync(romPath))("the Pokémon Center PC", () => {
     expect(world.save()).toEqual(saved);
   });
 
+  it("moves Pokémon between the party and boxes without mail", () => {
+    const world = fixture();
+    const data = world.assets.pokemon;
+    const [cyndaquil, pidgey] = world.state.party;
+    pidgey.hp = 1;
+    pidgey.pp = [1, 0, 0, 0];
+    const boxed = toBoxMon(
+      generatePartyMon(data, {
+        species: 19, // RATTATA
+        level: 6,
+        item: 0,
+        otId: world.playerId,
+        ot: "CHRIS",
+        dvs: 0x1234,
+        caughtData: 0,
+      }),
+    );
+    world.state.storage.boxes[0] = [boxed];
+    open(world);
+    pick(world, "BILL's PC");
+    expect(pick(world, "MOVE POKéMON W/O MAIL")).toEqual([
+      "Each time you move a POKéMON, data will be saved. OK?",
+    ]);
+    world.choose(1);
+    until(world);
+    // The party, then the fourteen boxes, with the current box highlighted.
+    const boxes = world.dialogue?.choice;
+    expect(boxes?.kind === "menu" && [boxes.items.length, boxes.selected]).toEqual([15, 1]);
+    expect(menuItems(world)[0]).toBe("PARTY POKéMON");
+    // PIDGEY from the party to the end of BOX1: its PP are restored.
+    pick(world, "PARTY POKéMON");
+    pick(world, /^PIDGEY/);
+    expect(menuItems(world)).toEqual(["MOVE", "STATS", "CANCEL"]);
+    pick(world, "MOVE");
+    pick(world, "BOX1");
+    expect(menuItems(world)).toEqual(["RATTATA", "▶"]);
+    pick(world, "▶");
+    // RATTATA from BOX1 to the front of the party, with full HP.
+    pick(world, "BOX1");
+    pick(world, /^RATTATA/);
+    pick(world, "MOVE");
+    pick(world, "PARTY POKéMON");
+    pick(world, /^CYNDAQUIL/);
+    expect(world.liveState.party.map((mon) => mon.species)).toEqual([19, 155]);
+    // Within the party: RATTATA to the end.
+    pick(world, "PARTY POKéMON");
+    pick(world, /^RATTATA/);
+    pick(world, "MOVE");
+    pick(world, "PARTY POKéMON");
+    pick(world, "▶");
+    close(world);
+    expect(world.state.party.map((mon) => mon.species)).toEqual([155, 19]);
+    const rattata = world.state.party[1];
+    expect(rattata.hp).toBe(rattata.stats[0]);
+    expect(rattata.stats).toEqual(calcStats(data, 19, 0x1234, 6, rattata.statExp));
+    expect(world.state.storage.boxes[0].map((mon) => mon.species)).toEqual([16]);
+    expect(world.state.storage.boxes[0][0].pp[0]).toBe(data.move(pidgey.moves[0]).pp);
+    expect(cyndaquil.species).toBe(155);
+  });
+
+  it("keeps the last Pokémon and refuses a full destination when moving", () => {
+    const world = fixture();
+    const data = world.assets.pokemon;
+    world.state.party = [world.state.party[0]];
+    const full = Array.from({ length: 20 }, () =>
+      toBoxMon(
+        generatePartyMon(data, {
+          species: 16,
+          level: 3,
+          item: 0,
+          otId: world.playerId,
+          ot: "CHRIS",
+          dvs: 0,
+          caughtData: 0,
+        }),
+      ),
+    );
+    world.state.storage.boxes[1] = full;
+    world.state.storage.boxes[2] = [structuredClone(full[0])];
+    world.state.storage.boxes[2][0].nickname = "SPARE";
+    open(world);
+    pick(world, "BILL's PC");
+    pick(world, "MOVE POKéMON W/O MAIL");
+    world.choose(1);
+    until(world);
+    pick(world, "PARTY POKéMON");
+    expect(pick(world, /^CYNDAQUIL/)).toEqual(["What's up?"]);
+    expect(pick(world, "MOVE")).toContain("It's your last POKéMON!");
+    // BOX3 into the full BOX2: no room, and the position is chosen again.
+    pick(world, "BOX3");
+    pick(world, /^SPARE/);
+    pick(world, "MOVE");
+    pick(world, "BOX2");
+    expect(pick(world, "▶")).toContain("There's no room!");
+    // B leaves the destination list for the list of boxes to move from.
+    world.advanceDialogue();
+    until(world);
+    // Within the full BOX2 a Pokémon can still move.
+    pick(world, "BOX2");
+    pick(world, /^PIDGEY/);
+    pick(world, "MOVE");
+    pick(world, "BOX2");
+    expect(pick(world, "▶")).toContain("Saving… Leave ON!");
+    close(world);
+    expect(world.state.storage.boxes[1]).toHaveLength(20);
+    expect(world.state.storage.boxes[2].map((mon) => mon.nickname)).toEqual(["SPARE"]);
+    expect(world.state.party).toHaveLength(1);
+  });
+
   it("opens the stats screen from Bill's PC for party and boxed Pokémon", () => {
     const world = fixture();
     const data = world.assets.pokemon;