Solution for this StackOverflow Question: https://stackoverflow.com/q/78325403/10006183

bot.dart

import 'dart:io';
import 'package:televerse/televerse.dart';

// Bot instance
final bot = Bot(
  Platform.environment["BOT_TOKEN"]!,
);

// - Variables - //

// The group/chat id
ChatID? id;

// Message ID of the poll (will be set once sent)
int? msgId;

// Poll Id of the poll (not really necessary)
String? pollId;

void main(List<String> args) {
  // Starts bot with Long Polling.
  bot.start();
  
  // /start command handler - simply sends a poll to the group/chat where /start command is recieved
  bot.command('start', (ctx) async {
    await ctx.reply("Here's a poll.");
    final msg = await ctx.replyWithPoll(
      "Are you ready for a trip next month?",
      ["YESSSS", "Nah"],
    );
    
    // Sets the variables
    id = msg.chat.getId();
    msgId = msg.messageId;
    pollId = msg.poll?.id;
  });
  
  // Handles the /stop command - stops the poll with `chat_id` and `message_id`.
  bot.command('stop', (ctx) async {
    // validation
    if (id == null || msgId == null) {
      await ctx.reply("Hmm, no way.");
      return;
    }
    
    // stopPoll API call
    await ctx.api.stopPoll(id!, msgId!);
  });

  
  // Listens to `poll` updates.
  bot.poll((ctx) async {
    // Recieved poll update
    final poll = ctx.poll!;
    
    // If poll is not closed we don't have to handle anything.
    if (!poll.isClosed) return;
    
    // Poll is closed, ie, this is the final Poll update related to this particular poll.
    await ctx.api.sendMessage(
      id!,
      "There we go. We finally have a poll result.",
    );
    
    // Just sorting the poll options based on the voter count. (Not necessary)
    poll.options.sort(((a, b) => b.voterCount.compareTo(a.voterCount)));
    
    // ...
    
    // Most voted option.
    final bestOption = poll.options.first;
    await ctx.api.sendMessage(
      id!,
      "The best option was ${bestOption.text} with ${(bestOption.voterCount / poll.totalVoterCount) * 100}% votes.",
    );
  });
}