Identify the 4 specific Honey Trees where Munchlax spawns in your save file.
Your visible 5-digit Trainer ID found on your Trainer Card.
Your hidden 5-digit ID. You may need external tools or a shiny Pokémon to find this.
About Munchlax Hunting in Sinnoh
In Pokémon Diamond, Pearl, Platinum, and the remakes Brilliant Diamond and Shining Pearl (BDSP), Munchlax is notoriously difficult to find. It does not appear in tall grass like typical Pokémon. Instead, it only appears on Honey Trees.
However, Munchlax does not spawn on just any Honey Tree. Out of the 21 Honey Trees scattered across the Sinnoh region, Munchlax can only spawn on 4 specific trees determined by your save file's unique identifiers.
Important: Even on the correct trees, Munchlax has only a 1% encounter rate. This calculator helps you stop wasting Honey on the 17 trees where Munchlax will never appear.
How the Calculation Works
The game determines your 4 Munchlax trees using your Trainer ID (TID) and your Secret ID (SID). The algorithm performs modulo operations on these IDs to generate four index numbers corresponding to tree locations.
Tree 1: Derived from the lowest byte of your SID.
Tree 2: Derived from the lowest byte of your TID.
Tree 3: Derived from the highest byte of your SID.
Tree 4: Derived from the highest byte of your TID.
If any calculation results in a duplicate tree location, the game shifts the index to the next available tree to ensure you always have exactly 4 unique locations.
Finding Your Secret ID (SID)
While your Trainer ID is visible on your profile card, your Secret ID is hidden. To find it, you typically need to:
Use a save file editor (like PKHeX).
Calculate it based on a random Shiny Pokémon you caught in the wild.
Trade a Pokémon to a bot or someone who can read the file data.
Honey Tree Locations Reference
The trees are located on various routes. Some require Surf or specific HMs to access. Once you have identified your trees using the calculator above, slather them with Honey and wait 6 hours for a chance to encounter Munchlax.
function calculateMunchlaxTrees() {
// Get input values
var tidInput = document.getElementById('trainerId');
var sidInput = document.getElementById('secretId');
var resultDiv = document.getElementById('munchlaxResult');
var tid = parseInt(tidInput.value);
var sid = parseInt(sidInput.value);
// Validation
if (isNaN(tid) || isNaN(sid)) {
resultDiv.style.display = "block";
resultDiv.innerHTML = 'Please enter both your Trainer ID and Secret ID.';
return;
}
if (tid 65535 || sid 65535) {
resultDiv.style.display = "block";
resultDiv.innerHTML = 'IDs must be between 0 and 65535.';
return;
}
// Tree Locations Mapping (Index 0 to 20)
var locations = [
"Route 205 (Floaroma Side)", // 0
"Route 205 (Eterna Side)", // 1
"Route 206", // 2
"Route 207", // 3
"Route 208", // 4
"Route 209", // 5
"Route 210 (South)", // 6
"Route 210 (North)", // 7
"Route 211 (East)", // 8
"Route 211 (West)", // 9
"Route 212 (North)", // 10
"Route 212 (South)", // 11
"Route 213", // 12
"Route 214", // 13
"Route 215", // 14
"Route 218", // 15
"Route 221", // 16
"Route 222", // 17
"Valley Windworks", // 18
"Fuego Ironworks", // 19
"Floaroma Meadow" // 20
];
// The logic based on DPPt/BDSP mechanism
// 1. Calculate base indices
var treeIndexes = [];
// Tree 1: SID % 256 % 21
var idx1 = (sid % 256) % 21;
treeIndexes.push(idx1);
// Tree 2: TID % 256 % 21
var idx2 = (tid % 256) % 21;
if (treeIndexes.includes(idx2)) {
idx2 = (idx2 + 1) % 21;
}
treeIndexes.push(idx2);
// Tree 3: (SID / 256) % 21
// Note: Using bitwise shift right by 8 is equivalent to integer division by 256 for positive integers
var idx3 = ((sid >> 8) % 256) % 21;
while (treeIndexes.includes(idx3)) {
idx3 = (idx3 + 1) % 21;
}
treeIndexes.push(idx3);
// Tree 4: (TID / 256) % 21
var idx4 = ((tid >> 8) % 256) % 21;
while (treeIndexes.includes(idx4)) {
idx4 = (idx4 + 1) % 21;
}
treeIndexes.push(idx4);
// Sort indexes to output them nicely (optional, but looks better)
treeIndexes.sort(function(a, b) { return a – b; });
// Generate HTML Output
var outputHtml = "
Your Munchlax Trees
";
outputHtml += "
";
for (var i = 0; i < treeIndexes.length; i++) {
var locationName = locations[treeIndexes[i]];
outputHtml += "
Tree " + (i + 1) + ": " + locationName + "
";
}
outputHtml += "
";
outputHtml += "Note: Slather these trees with Honey. There is a 1% chance for Munchlax to appear after 6 hours.";
resultDiv.style.display = "block";
resultDiv.innerHTML = outputHtml;
}