It's because on line 6 where you try to fetch, you're not logged in. You're calling bot.login() later (and it's async)

const guild = bot.guilds.fetch('222078108977594368')

Check https://discordjs.guide/popular-topics/errors.html#request-to-use-token-but-token-was-unavailable-to-the-client

If you want to fetch it only once, you can probably move this to the ready state's handler:

const Discord = require('discord.js')

const { send, stdout } = require('process')



const bot = new Discord.Client()

const token = 'XXX'

const prefix = 'a!'

// use let, so you can change it later in bot.on('ready')

let guild = null



// this event will only trigger after logging in

bot.on('ready', () => {

  const ping = new Date()

  // fetch here

  guild = bot.guilds.fetch('222078108977594368')



  ping.setHours(ping.getHours() - 3)

  console.log(`BOT INICIADO AS ${ping.getUTCHours()}:${ping.getUTCMinutes()}:${ping.getUTCSeconds()}`)

  console.log('GuruGuru Está Online!')



  bot.user.setActivity(`${bot.guilds.cache.size} servidores`, { type: 'WATCHING' });

})